linked list
linked list和arraylist各有所长,arraylist适用于很多调用get方法的场合,不适用于很多insert等改变list的size的场合,因为当数据插入到arraylist的时候实际上系统会新分配一段内存给一个新的list,然后把原来的list的内容和新插入的内容一起放到新建的list里面,这样当数据很大的时候,是很耗费系统资源的,性能也差。linked list正好相反,由于linked list的链接是通过内存指针指向相邻的node的方式联系起来的,通过这种方式,insert和add变得非常得容易,然而linked list的不足之处也很明显,由于node彼此之间的联系是通过内存指向连接起来的,因为想查找一个给定的对象,需要从linked list的头或尾找起,一个一个得找,直到找到特定的对象为止,因此当数据很多的时候,get方法的效率就会很低。下面是我写的singly linked list和doubly linked list的代码:
1
package utilities;
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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/**
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* The List interface described below is the basis for learning Linear data
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* types. It is not a involved as the <code>java.util.List</code>. It will
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* not define any searching or iteration methods that would normally be a part
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* of the List interface.
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*/
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public interface List
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{
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// ADD OPERATIONS
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/**
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* Method to append an element to the end of a List. If the list is empty
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* the element will be added to the first position.
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*
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* @param o - element to be added to the list
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*/
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public boolean append(Object o);
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/**
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* Method to add an element to the FIRST position in the list. If the list
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* is empty, the element will be added to the first position.
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*
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* @param o - element to be added to the list
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*/
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public boolean add(Object o);
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/**
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* Method to add an element to a specific position in the list. If the
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* position is an index outside of the bounds of the list an exception is
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* raised.
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*
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* @param o - element to be added to the list
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* @param position - index that the element should be placed at
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* @throws IndexOutOfBoundsException when the index is (position<0 ||
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* position > size())
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*/
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public boolean add(Object o, int position) throws IndexOutOfBoundsException;
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// REMOVE OPERATIONS
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/**
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* Clears the list, all elements are lost
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*/
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public void clear();
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/**
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* Removes the <b>FIRST</b> element in the list and changes the index for
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* all the remaining elements by (-1).<br>
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*
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* @return Object element at the first position of the list. If the list is
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* empty, returns a <code>null</code> reference.
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*/
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public Object remove();
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/**
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* Removes the <b>LAST</b> element in the list.
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*
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* @return Object element at the last postion of the list. If list is empty,
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* returns a <code>null</code> reference.
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*/
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public Object removeLast();
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/**
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* Removes the element at the provided index, if the index is outside the
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* bounds of the the list an exception is thrown
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*
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* @param position the position in the list of the element to be removed
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* @return Object element being removed from the list
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* @throws IndexOutOfBoundsException when the index is (position<0 ||
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* position > size())
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*/
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public Object remove(int position) throws IndexOutOfBoundsException;
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// UTILITY METHODS
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/**
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* Gets a refernce to the first element in the list without disturbing the
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* list structure.
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*
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* @return Object reference to the fist element in the list, if the list is
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* empty, returns a <code>null</code> reference.
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*/
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public Object get();
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/**
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* Gets a reference to the last element in the list, without distrubing the
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* list structure.
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*
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* @return Object reference to the last element in the list, if the list is
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* empty, returns a <code>null</code> reference.
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*/
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public Object getLast();
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/**
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* Gets a reference to the element at the specified postion. If the List is
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* empty returns a <code>null</code> reference.
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*
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* @param position the location within the list of the desired element
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* @return Object reference to the specified element
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* @throws IndexOutOfBoundsException when the index is (position<0 ||
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* position > size())
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*/
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public Object get(int position) throws IndexOutOfBoundsException;
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/**
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* Checks the list and determines if the object exists in the list, if the
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* object is present in the list, the method returns true.
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*
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* @return <code>boolean</code> true if object is in list, otherwise
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* false.
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*/
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public boolean contains(Object o);
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/**
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* Returns the index in this list of the first occurrence of the specified
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* element, or -1 if the List does not contain this element.
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*
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* @return <code>int</code>, the index in this list of the first
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* occurrence of the specified element, or -1 if the list does not
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* contain this element.
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*/
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public int indexOf(Object o);
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/**
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* Gets the current number of elements in the list, if list is empty returns
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* a 0 (zero).
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*
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* @return <code>int</code>, an integer greater or equal to zero
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*/
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public int size();
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/**
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* Returns the current status of the list.
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*
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* @return <code>boolean</code> false if the list conatins any elements.
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*/
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public boolean isEmpty();
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}
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1
package utilities;
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
import java.io.*;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
/**
6
* @author
7
* @version 1.0
8
*/
9
public class SLLNode implements Serializable
10
{
11
/**
12
*
13
*/
14
private static final long serialVersionUID = 1L;
15
private Object element;
16
private SLLNode next;
17
18
/**
19
* @param element
20
*/
21
public SLLNode(Object element)
22
{
23
this.element = element;
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this.next = null;
25
}
26
27
/**
28
* @return the element
29
*/
30
public Object getElement()
31
{
32
return element;
33
}
34
35
/**
36
* @param element the element to set
37
*/
38
public void setElement(Object element)
39
{
40
this.element = element;
41
}
42
43
/**
44
* @return the next
45
*/
46
public SLLNode getNext()
47
{
48
return next;
49
}
50
51
/**
52
* @param next the next to set
53
*/
54
public void setNext(SLLNode next)
55
{
56
this.next = next;
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}
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}
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1
package utilities;
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
import java.io.*;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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/**
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* @author
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* @version 1.0
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*/
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public class SLL implements List, Serializable
10
{
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/**
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* Attributes
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*/
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private static final long serialVersionUID = 1L;
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private SLLNode head;
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private int size;
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18
/**
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* Default Constructor
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*/
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public SLL()
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{
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this.head = null;
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this.size = 0;
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}
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/*
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* (non-Javadoc)
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*
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* @see utilities.List#add(java.lang.Object)
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*/
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public boolean add(Object object)
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{
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if (this.size == 0)
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{
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this.head = new SLLNode(object);
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this.size++;
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}
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else
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{
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SLLNode added = new SLLNode(object);
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added.setNext(this.head);
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this.head = added;
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this.size++;
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}
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return true;
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}
48
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/*
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* (non-Javadoc)
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*
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* @see utilities.List#add(java.lang.Object, int)
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*/
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public boolean add(Object object, int position)
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{
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if ((position < 0 || position > this.size - 1) && this.size != 0)
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{
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throw new IndexOutOfBoundsException();
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}
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if (this.size == 0)
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{
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this.head = new SLLNode(object);
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this.size++;
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}
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else
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{
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SLLNode added = new SLLNode(object);
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if (position == 0)
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{
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added.setNext(this.head);
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this.head = added;
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this.size++;
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}
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else
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{
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SLLNode previous = getSLLNode(position - 1);
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SLLNode next = getSLLNode(position);
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previous.setNext(added);
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added.setNext(next);
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this.size++;
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}
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}
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return true;
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}
85
86
/*
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* (non-Javadoc)
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*
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* @see utilities.List#append(java.lang.Object)
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*/
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public boolean append(Object object)
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{
93
if (this.size == 0)
94
{
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this.head = new SLLNode(object);
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this.size++;
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}
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else
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{
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SLLNode added = new SLLNode(object);
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SLLNode current = this.head;
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while (current.getNext() != null)
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{
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current = current.getNext();
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}
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current.setNext(added);
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this.size++;
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}
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return true;
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}
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112
/*
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* (non-Javadoc)
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*
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* @see utilities.List#clear()
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*/
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public void clear()
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{
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this.head = null;
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this.size = 0;
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}
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123
/*
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* (non-Javadoc)
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*
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* @see utilities.List#contains(java.lang.Object)
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*/
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public boolean contains(Object object)
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{
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SLLNode current = this.head;
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do
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{
133
if (current.getElement().equals(object))
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{
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return true;
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}
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else
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{
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current = current.getNext();
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}
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}
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while (current != null);
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return false;
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}
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146
/*
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* (non-Javadoc)
148
*
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* @see utilities.List#get()
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*/
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public Object get()
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{
153
if (this.size == 0)
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{
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return null;
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}
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return this.head.getElement();
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}
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/**
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* Method that will get the SLLNode at a given position
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*
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* @param position the position of the SLLNode
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* @return the SLLNode of that position
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* @throws IndexOutOfBoundsException
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*/
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private SLLNode getSLLNode(int position) throws IndexOutOfBoundsException
168
{
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if ((position < 0 || position > this.size - 1) && this.size != 0)
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{
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throw new IndexOutOfBoundsException();
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}
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if (this.size == 0)
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{
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return null;
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}
177
SLLNode current = this.head;
178
for (int i = 0; i < position; i++)
179
{
180
current = current.getNext();
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}
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return current;
183
}
184
185
/*
186
* (non-Javadoc)
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*
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* @see utilities.List#get(int)
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*/
190
public Object get(int position) throws IndexOutOfBoundsException
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{
192
if ((position < 0 || position > this.size - 1) && this.size != 0)
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{
194
throw new IndexOutOfBoundsException();
195
}
196
if (this.size == 0)
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{
198
return null;
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}
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return getSLLNode(position).getElement();
201
}
202
203
/*
204
* (non-Javadoc)
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*
206
* @see utilities.List#getLast()
207
*/
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public Object getLast()
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{
210
if (this.size == 0)
211
{
212
return null;
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}
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SLLNode last = this.head;
215
while (last.getNext() != null)
216
{
217
last = last.getNext();
218
}
219
return last.getElement();
220
}
221
222
/*
223
* (non-Javadoc)
224
*
225
* @see utilities.List#indexOf(java.lang.Object)
226
*/
227
public int indexOf(Object object)
228
{
229
if (this.size == 0)
230
{
231
return -1;
232
}
233
else
234
{
235
SLLNode current = this.head;
236
int i = 0;
237
do
238
{
239
if (current.getElement().equals(object))
240
{
241
return i;
242
}
243
else
244
{
245
current = current.getNext();
246
i++;
247
}
248
}
249
while (current != null);
250
return i;
251
}
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}
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/*
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* (non-Javadoc)
256
*
257
* @see utilities.List#isEmpty()
258
*/
259
public boolean isEmpty()
260
{
261
if (this.size == 0)
262
{
263
return true;
264
}
265
else
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{
267
return false;
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}
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}
270
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/*
272
* (non-Javadoc)
273
*
274
* @see utilities.List#remove()
275
*/
276
public Object remove()
277
{
278
if (this.size == 0)
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{
280
return null;
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}
282
else if (this.size == 1)
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{
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Object object = this.head.getElement();
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this.head = null;
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this.size--;
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return object;
288
}
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else
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{
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Object object = this.head.getElement();
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this.head = this.head.getNext();
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this.size--;
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return object;
295
}
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}
297
298
/*
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* (non-Javadoc)
300
*
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* @see utilities.List#remove(int)
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*/
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public Object remove(int position) throws IndexOutOfBoundsException
304
{
305
if ((position < 0 || position > this.size - 1) && this.size != 0)
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{
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throw new IndexOutOfBoundsException();
308
}
309
if (this.size == 0)
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{
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return null;
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}
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else if (this.size == 1)
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{
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Object object = this.head.getElement();
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this.head = null;
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this.size--;
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return object;
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}
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else
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{
322
if (position == this.size - 1)
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{
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SLLNode last = getSLLNode(this.size - 2);
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SLLNode deleted = last.getNext();
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Object object = deleted.getElement();
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last.setNext(null);
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this.size--;
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return object;
330
}
331
else if (position == 0)
332
{
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Object object = this.head.getElement();
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this.head = this.head.getNext();
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this.size--;
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return object;
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}
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else
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{
340
SLLNode previous = getSLLNode(position - 1);
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SLLNode current = previous.getNext();
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SLLNode next = current.getNext();
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previous.setNext(next);
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this.size--;
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return current.getElement();
346
}
347
}
348
}
349
350
/*
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* (non-Javadoc)
352
*
353
* @see utilities.List#removeLast()
354
*/
355
public Object removeLast()
356
{
357
if (this.size == 0)
358
{
359
return null;
360
}
361
else if (this.size == 1)
362
{
363
Object object = this.head.getElement();
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this.head = null;
365
this.size--;
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return object;
367
}
368
else
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{
370
SLLNode last = getSLLNode(this.size - 2);
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SLLNode deleted = last.getNext();
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Object object = deleted.getElement();
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last.setNext(null);
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this.size--;
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return object;
376
}
377
}
378
379
/*
380
* (non-Javadoc)
381
*
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* @see utilities.List#size()
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*/
384
public int size()
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{
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return this.size;
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}
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}
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1
package utilities;
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
import junit.framework.TestCase;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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/**
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* @author
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* @version 1.0
8
*/
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public class SLLTest extends TestCase
10
{
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private SLL list;
12
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/**
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* @throws java.lang.Exception
15
*/
16
protected void setUp() throws Exception
17
{
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super.setUp();
19
list = new SLL();
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list.append("Have");
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list.append("a");
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list.append("good");
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list.append("day");
24
}
25
26
/**
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* @throws java.lang.Exception
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*/
29
protected void tearDown() throws Exception
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{
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super.tearDown();
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list = null;
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}
34
35
/**
36
* Test method for {@link utilities.SLL#add(java.lang.Object)}.
37
*/
38
public void testAddObject()
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{
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list.add("Head,hey?");
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System.out.println("--. TEST ADD METHOD");
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String expected = "Head,hey?";
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String actual = (String)(list.get(0));
44
assertEquals("Error",expected,actual);
45
}
46
47
/**
48
* Test method for {@link utilities.SLL#add(java.lang.Object, int)}.
49
*/
50
public void testAddObjectInt()
51
{
52
list.add("Add it at the head",1);
53
System.out.println("--. TEST ADD METHOD WITH POSITION");
54
String expected = "Add it at the head";
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String actual = (String)(list.get(1));
56
assertEquals("Error",expected,actual);
57
}
58
59
/**
60
* Test method for {@link utilities.SLL#append(java.lang.Object)}.
61
*/
62
public void testAppend()
63
{
64
list.append("Tail,hey?");
65
System.out.println("--. TEST APPEND METHOD");
66
String expected = "Tail,hey?";
67
String actual = (String)(list.get(list.size()-1));
68
assertEquals("Error",expected,actual);
69
}
70
71
/**
72
* Test method for {@link utilities.SLL#clear()}.
73
*/
74
public void testClear()
75
{
76
list.clear();
77
System.out.println("--. TEST CLEAR METHOD");
78
int expected = 0;
79
int actual = list.size();
80
assertEquals("Error",expected,actual);
81
}
82
83
/**
84
* Test method for {@link utilities.SLL#contains(java.lang.Object)}.
85
*/
86
public void testContains()
87
{
88
System.out.println("--. TEST CONTAINS METHOD");
89
boolean expected = true;
90
boolean actual = list.contains("good");
91
assertEquals("Error",expected,actual);
92
}
93
94
/**
95
* Test method for {@link utilities.SLL#get()}.
96
*/
97
public void testGet()
98
{
99
System.out.println("--. TEST GET METHOD");
100
String expected = "Have";
101
String actual = (String)list.get();
102
assertEquals("Error",expected,actual);
103
}
104
105
/**
106
* Test method for {@link utilities.SLL#get(int)}.
107
*/
108
public void testGetInt()
109
{
110
System.out.println("--. TEST GET(POSITION) METHOD");
111
String expected = "good";
112
String actual = (String)list.get(2);
113
assertEquals("Error",expected,actual);
114
}
115
116
/**
117
* Test method for {@link utilities.SLL#getLast()}.
118
*/
119
public void testGetLast()
120
{
121
System.out.println("--. TEST GETLAST METHOD");
122
String expected = "day";
123
String actual = (String)list.getLast();
124
assertEquals("Error",expected,actual);
125
}
126
127
/**
128
* Test method for {@link utilities.SLL#indexOf(java.lang.Object)}.
129
*/
130
public void testIndexOf()
131
{
132
System.out.println("--. TEST INDEXOF METHOD");
133
int expected = 0;
134
int actual = list.indexOf("Have");
135
assertEquals("Error",expected,actual);
136
}
137
138
/**
139
* Test method for {@link utilities.SLL#isEmpty()}.
140
*/
141
public void testIsEmpty()
142
{
143
System.out.println("--. TEST ISEMPTY METHOD");
144
boolean expected = false;
145
boolean actual = list.isEmpty();
146
assertEquals("Error",expected,actual);
147
}
148
149
/**
150
* Test method for {@link utilities.SLL#remove()}.
151
*/
152
public void testRemove()
153
{
154
System.out.println("--. TEST REMOVE METHOD");
155
String expected = "Have";
156
String actual = (String)list.remove();
157
assertEquals("Error",expected,actual);
158
}
159
160
/**
161
* Test method for {@link utilities.SLL#remove(int)}.
162
*/
163
public void testRemoveInt()
164
{
165
System.out.println("--. TEST REMOVE(INT) METHOD");
166
String expected = "Have";
167
String actual = (String)list.remove(0);
168
assertEquals("Error",expected,actual);
169
}
170
171
/**
172
* Test method for {@link utilities.SLL#removeLast()}.
173
*/
174
public void testRemoveLast()
175
{
176
System.out.println("--. TEST REMOVELAST METHOD");
177
String expected = "day";
178
String actual = (String)list.removeLast();
179
assertEquals("Error",expected,actual);
180
}
181
182
/**
183
* Test method for {@link utilities.SLL#size()}.
184
*/
185
public void testSize()
186
{
187
System.out.println("--. TEST SIZE METHOD");
188
int expected = 4;
189
int actual = list.size();
190
assertEquals("Error",expected,actual);
191
}
192
}
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1
package utilities;
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
import java.io.*;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
/**
6
* @author
7
* @version 1.0
8
*
9
*/
10
public class DLLNode implements Serializable
11
{
12
/**
13
*
14
*/
15
private static final long serialVersionUID = 1L;
16
/**
17
* Attributes
18
*/
19
private Object element;
20
private DLLNode previous;
21
private DLLNode next;
22
23
/**
24
* Constructor
25
* @param element the element to set
26
*/
27
public DLLNode(Object element)
28
{
29
this.element = element;
30
this.previous = null;
31
this.next = null;
32
}
33
34
/**
35
* @return the element
36
*/
37
public Object getElement()
38
{
39
return element;
40
}
41
42
/**
43
* @param element the element to set
44
*/
45
public void setElement(Object element)
46
{
47
this.element = element;
48
}
49
50
/**
51
* @return the next
52
*/
53
public DLLNode getNext()
54
{
55
return next;
56
}
57
58
/**
59
* @param next the next to set
60
*/
61
public void setNext(DLLNode next)
62
{
63
this.next = next;
64
}
65
66
/**
67
* @return the previous
68
*/
69
public DLLNode getPrevious()
70
{
71
return previous;
72
}
73
74
/**
75
* @param previous the previous to set
76
*/
77
public void setPrevious(DLLNode previous)
78
{
79
this.previous = previous;
80
}
81
}
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1
package utilities;
2![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
import java.io.*;
4![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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/**
6
* @author
7
* @version 1.0
8
*/
9
public class DLL implements List, Serializable
10
{
11
/**
12
* Attributes
13
*/
14
private static final long serialVersionUID = 1L;
15
private DLLNode head;
16
private DLLNode tail;
17
private int size;
18
19
/**
20
* Default Constructor
21
*/
22
public DLL()
23
{
24
this.head = null;
25
this.tail = null;
26
this.size = 0;
27
}
28
29
/*
30
* (non-Javadoc)
31
*
32
* @see utilities.List#add(java.lang.Object)
33
*/
34
public boolean add(Object object)
35
{
36
if (this.size == 0)
37
{
38
this.head = new DLLNode(object);
39
this.tail = new DLLNode(object);
40
this.size++;
41
}
42
else if (this.size == 1)
43
{
44
DLLNode added = new DLLNode(object);
45
added.setNext(this.tail);
46
this.tail.setPrevious(added);
47
this.head = added;
48
this.size++;
49
}
50
else
51
{
52
DLLNode added = new DLLNode(object);
53
added.setNext(this.head);
54
this.head.setPrevious(added);
55
this.head = added;
56
this.size++;
57
}
58
return true;
59
}
60
61
/*
62
* (non-Javadoc)
63
*
64
* @see utilities.List#add(java.lang.Object, int)
65
*/
66
public boolean add(Object object, int position)
67
throws IndexOutOfBoundsException
68
{
69
if ((position < 0 || position > this.size - 1) && this.size != 0)
70
{
71
throw new IndexOutOfBoundsException();
72
}
73
if (this.size == 0)
74
{
75
this.head = new DLLNode(object);
76
this.tail = new DLLNode(object);
77
this.size++;
78
}
79
else if (this.size == 1)
80
{
81
DLLNode added = new DLLNode(object);
82
added.setNext(this.tail);
83
this.tail.setPrevious(added);
84
this.head = added;
85
this.size++;
86
}
87
else
88
{
89
DLLNode added = new DLLNode(object);
90
if (position == 0)
91
{
92
added.setNext(this.head);
93
this.head.setPrevious(added);
94
this.head = added;
95
this.size++;
96
}
97
else
98
{
99
DLLNode previous = getDLLNode(position - 1);
100
DLLNode next = getDLLNode(position);
101
added.setPrevious(previous);
102
added.setNext(next);
103
previous.setNext(added);
104
next.setPrevious(added);
105
this.size++;
106
}
107
}
108
return true;
109
}
110
111
/*
112
* (non-Javadoc)
113
*
114
* @see utilities.List#append(java.lang.Object)
115
*/
116
public boolean append(Object object)
117
{
118
if (this.size == 0)
119
{
120
this.head = new DLLNode(object);
121
this.tail = new DLLNode(object);
122
this.size++;
123
}
124
else if (this.size == 1)
125
{
126
DLLNode added = new DLLNode(object);
127
added.setPrevious(this.head);
128
this.head.setNext(added);
129
this.tail = added;
130
this.size++;
131
}
132
else
133
{
134
DLLNode appended = new DLLNode(object);
135
appended.setPrevious(this.tail);
136
this.tail.setNext(appended);
137
this.tail = appended;
138
this.size++;
139
}
140
return true;
141
}
142
143
/*
144
* (non-Javadoc)
145
*
146
* @see utilities.List#clear()
147
*/
148
public void clear()
149
{
150
this.head = null;
151
this.tail = null;
152
this.size = 0;
153
}
154
155
/*
156
* (non-Javadoc)
157
*
158
* @see utilities.List#contains(java.lang.Object)
159
*/
160
public boolean contains(Object object)
161
{
162
DLLNode current = this.head;
163
do
164
{
165
if (current.getElement().equals(object))
166
{
167
return true;
168
}
169
else
170
{
171
current = current.getNext();
172
}
173
}
174
while (current != null);
175
return false;
176
}
177
178
/*
179
* (non-Javadoc)
180
*
181
* @see utilities.List#get()
182
*/
183
public Object get()
184
{
185
if (this.size == 0)
186
{
187
return null;
188
}
189
return this.head.getElement();
190
}
191
192
/**
193
* Method that will get the DLLNode at a given position
194
*
195
* @param position the position of the DLLNode
196
* @return the DLLNode of that position
197
* @throws IndexOutOfBoundsException
198
*/
199
private DLLNode getDLLNode(int position) throws IndexOutOfBoundsException
200
{
201
if ((position < 0 || position > this.size - 1) && this.size != 0)
202
{
203
throw new IndexOutOfBoundsException();
204
}
205
if (this.size == 0)
206
{
207
return null;
208
}
209
DLLNode current;
210
if (position - 0 < this.size - position)
211
{
212
current = this.head;
213
for (int i = 0; i < position; i++)
214
{
215
current = current.getNext();
216
}
217
}
218
else
219
{
220
current = this.tail;
221
for (int i = this.size - 1; i > position; i--)
222
{
223
current = current.getPrevious();
224
}
225
}
226
return current;
227
}
228
229
/*
230
* (non-Javadoc)
231
*
232
* @see utilities.List#get(int)
233
*/
234
public Object get(int position) throws IndexOutOfBoundsException
235
{
236
if ((position < 0 || position > this.size - 1) && this.size != 0)
237
{
238
throw new IndexOutOfBoundsException();
239
}
240
if (this.size == 0)
241
{
242
return null;
243
}
244
return getDLLNode(position).getElement();
245
}
246
247
/*
248
* (non-Javadoc)
249
*
250
* @see utilities.List#getLast()
251
*/
252
public Object getLast()
253
{
254
if (this.size == 0)
255
{
256
return null;
257
}
258
return this.tail.getElement();
259
}
260
261
/*
262
* (non-Javadoc)
263
*
264
* @see utilities.List#indexOf(java.lang.Object)
265
*/
266
public int indexOf(Object object)
267
{
268
if (this.size == 0)
269
{
270
return -1;
271
}
272
else
273
{
274
DLLNode current = this.head;
275
int i = 0;
276
do
277
{
278
if (current.getElement().equals(object))
279
{
280
return i;
281
}
282
else
283
{
284
current = current.getNext();
285
i++;
286
}
287
}
288
while (current != null);
289
return i;
290
}
291
}
292
293
/*
294
* (non-Javadoc)
295
*
296
* @see utilities.List#isEmpty()
297
*/
298
public boolean isEmpty()
299
{
300
if (this.size == 0)
301
{
302
return true;
303
}
304
else
305
{
306
return false;
307
}
308
}
309
310
/*
311
* (non-Javadoc)
312
*
313
* @see utilities.List#remove()
314
*/
315
public Object remove()
316
{
317
if (this.size == 0)
318
{
319
return null;
320
}
321
else if (this.size == 1)
322
{
323
Object object = this.head.getElement();
324
this.head = null;
325
this.tail = null;
326
this.size--;
327
return object;
328
}
329
else if (this.size == 2)
330
{
331
Object object = this.head.getElement();
332
this.tail.setPrevious(null);
333
this.head.setNext(null);
334
this.head.setElement(this.tail.getElement());
335
return object;
336
}
337
else
338
{
339
Object object = this.head.getElement();
340
this.head = this.head.getNext();
341
this.head.setPrevious(null);
342
this.size--;
343
return object;
344
}
345
}
346
347
/*
348
* (non-Javadoc)
349
*
350
* @see utilities.List#remove(int)
351
*/
352
public Object remove(int position) throws IndexOutOfBoundsException
353
{
354
if ((position < 0 || position > this.size - 1) && this.size != 0)
355
{
356
throw new IndexOutOfBoundsException();
357
}
358
if (this.size == 0)
359
{
360
return null;
361
}
362
else if (this.size == 1)
363
{
364
Object object = this.head.getElement();
365
this.head = null;
366
this.tail = null;
367
this.size--;
368
return object;
369
}
370
else if (this.size == 2)
371
{
372
if (position == 0)
373
{
374
Object object = this.head.getElement();
375
this.tail.setPrevious(null);
376
this.head.setNext(null);
377
this.head.setElement(this.tail.getElement());
378
this.size--;
379
return object;
380
}
381
else
382
{
383
Object object = this.tail.getElement();
384
this.head.setNext(null);
385
this.tail.setPrevious(null);
386
this.tail.setElement(this.head.getElement());
387
this.size--;
388
return object;
389
}
390
}
391
else
392
{
393
if (position == this.size - 1)
394
{
395
Object object = this.tail.getElement();
396
this.tail = this.tail.getPrevious();
397
this.tail.setNext(null);
398
this.size--;
399
return object;
400
}
401
else if (position == 0)
402
{
403
Object object = this.head.getElement();
404
this.head = this.head.getNext();
405
this.head.setPrevious(null);
406
this.size--;
407
return object;
408
}
409
else
410
{
411
DLLNode current = getDLLNode(position);
412
DLLNode previous = current.getPrevious();
413
DLLNode next = current.getNext();
414
previous.setNext(next);
415
next.setPrevious(previous);
416
this.size--;
417
return current.getElement();
418
}
419
}
420
}
421
422
/*
423
* (non-Javadoc)
424
*
425
* @see utilities.List#removeLast()
426
*/
427
public Object removeLast()
428
{
429
if (this.size == 0)
430
{
431
return null;
432
}
433
else if (this.size == 1)
434
{
435
Object object = this.tail.getElement();
436
this.head = null;
437
this.tail = null;
438
this.size--;
439
return object;
440
}
441
else if (this.size == 2)
442
{
443
Object object = this.tail.getElement();
444
this.head.setNext(null);
445
this.tail.setPrevious(null);
446
this.tail.setElement(this.head.getElement());
447
this.size--;
448
return object;
449
}
450
else
451
{
452
Object object = this.tail.getElement();
453
this.tail = this.tail.getPrevious();
454
this.tail.setNext(null);
455
this.size--;
456
return object;
457
}
458
}
459
460
/*
461
* (non-Javadoc)
462
*
463
* @see utilities.List#size()
464
*/
465
public int size()
466
{
467
return this.size;
468
}
469
}
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1
package utilities;
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import junit.framework.TestCase;
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/**
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* @author
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* @version 1.0
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*/
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public class DLLTest extends TestCase
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{
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private DLL list;
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/**
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* @throws java.lang.Exception
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*/
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protected void setUp() throws Exception
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{
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super.setUp();
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list = new DLL();
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list.append("Have");
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list.append("a");
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list.append("good");
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list.append("day");
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}
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/**
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* @throws java.lang.Exception
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*/
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protected void tearDown() throws Exception
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{
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super.tearDown();
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list = null;
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}
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/**
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* Test method for {@link utilities.SLL#add(java.lang.Object)}.
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*/
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public void testAddObject()
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{
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list.add("Head,hey?");
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System.out.println("--. TEST ADD METHOD");
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String expected = "Head,hey?";
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String actual = (String)(list.get(0));
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assertEquals("Error",expected,actual);
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}
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/**
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* Test method for {@link utilities.SLL#add(java.lang.Object, int)}.
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*/
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public void testAddObjectInt()
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{
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list.add("Add it at the head",1);
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System.out.println("--. TEST ADD METHOD WITH POSITION");
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String expected = "Add it at the head";
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String actual = (String)(list.get(1));
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assertEquals("Error",expected,actual);
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}
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/**
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* Test method for {@link utilities.SLL#append(java.lang.Object)}.
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*/
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public void testAppend()
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{
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list.append("Tail,hey?");
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System.out.println("--. TEST APPEND METHOD");
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String expected = "Tail,hey?";
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String actual = (String)(list.get(list.size()-1));
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assertEquals("Error",expected,actual);
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}
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/**
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* Test method for {@link utilities.SLL#clear()}.
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*/
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public void testClear()
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{
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list.clear();
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System.out.println("--. TEST CLEAR METHOD");
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int expected = 0;
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int actual = list.size();
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assertEquals("Error",expected,actual);
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}
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/**
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* Test method for {@link utilities.SLL#contains(java.lang.Object)}.
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*/
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public void testContains()
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{
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System.out.println("--. TEST CONTAINS METHOD");
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boolean expected = true;
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boolean actual = list.contains("good");
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assertEquals("Error",expected,actual);
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}
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94
/**
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* Test method for {@link utilities.SLL#get()}.
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*/
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public void testGet()
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{
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System.out.println("--. TEST GET METHOD");
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String expected = "Have";
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String actual = (String)list.get();
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assertEquals("Error",expected,actual);
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}
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105
/**
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* Test method for {@link utilities.SLL#get(int)}.
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*/
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public void testGetInt()
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{
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System.out.println("--. TEST GET(POSITION) METHOD");
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String expected = "good";
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String actual = (String)list.get(2);
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assertEquals("Error",expected,actual);
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}
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116
/**
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* Test method for {@link utilities.SLL#getLast()}.
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*/
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public void testGetLast()
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{
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System.out.println("--. TEST GETLAST METHOD");
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String expected = "day";
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String actual = (String)list.getLast();
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assertEquals("Error",expected,actual);
125
}
126
127
/**
128
* Test method for {@link utilities.SLL#indexOf(java.lang.Object)}.
129
*/
130
public void testIndexOf()
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{
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System.out.println("--. TEST INDEXOF METHOD");
133
int expected = 0;
134
int actual = list.indexOf("Have");
135
assertEquals("Error",expected,actual);
136
}
137
138
/**
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* Test method for {@link utilities.SLL#isEmpty()}.
140
*/
141
public void testIsEmpty()
142
{
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System.out.println("--. TEST ISEMPTY METHOD");
144
boolean expected = false;
145
boolean actual = list.isEmpty();
146
assertEquals("Error",expected,actual);
147
}
148
149
/**
150
* Test method for {@link utilities.SLL#remove()}.
151
*/
152
public void testRemove()
153
{
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System.out.println("--. TEST REMOVE METHOD");
155
String expected = "Have";
156
String actual = (String)list.remove();
157
assertEquals("Error",expected,actual);
158
}
159
160
/**
161
* Test method for {@link utilities.SLL#remove(int)}.
162
*/
163
public void testRemoveInt()
164
{
165
System.out.println("--. TEST REMOVE(INT) METHOD");
166
String expected = "Have";
167
String actual = (String)list.remove(0);
168
assertEquals("Error",expected,actual);
169
}
170
171
/**
172
* Test method for {@link utilities.SLL#removeLast()}.
173
*/
174
public void testRemoveLast()
175
{
176
System.out.println("--. TEST REMOVELAST METHOD");
177
String expected = "day";
178
String actual = (String)list.removeLast();
179
assertEquals("Error",expected,actual);
180
}
181
182
/**
183
* Test method for {@link utilities.SLL#size()}.
184
*/
185
public void testSize()
186
{
187
System.out.println("--. TEST SIZE METHOD");
188
int expected = 4;
189
int actual = list.size();
190
assertEquals("Error",expected,actual);
191
}
192
}
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