public class Arraytwo <E> {
private E[] data;
private int size;
@SuppressWarnings("unchecked")
public Arraytwo(int capacity) {
data = (E[])new Object[capacity];
size = 0;
}
public Arraytwo() { this(10);}
public int getsize() { return size; }
public int getcapacity() { return data.length; }
public boolean isEmpty() { return size == 0; }
public void addLast(E e) { add(size, e); }
public void addFirst(E e) { add(0, e); }
public void add(int index, E e) {
if(index < 0 || index > size)
throw new IllegalArgumentException("Add failed. Require index >= 0 add size");
if(size == data.length)
resize(2 * data.length);
for (int i = size - 1 ; i >= index ; i --)
data[i + 1] = data[i];
data[index] = e;
size ++;
}
public E get(int index) {
if(index < 0 || index >= size)
throw new IllegalArgumentException("Get failed.Index is illegal.");
return data[index];
}
public void set(int index, E e) {
if(index < 0 || index >= size)
throw new IllegalArgumentException("Get failed.Index is illegal.");
data[index] = e;
}
public boolean contains(E e) {
for (int i = 0; i < size; i ++) {
if (data[i].equals(e))
return true;
}
return false;
}
public int find(E e) {
for (int i = 0; i < size; i ++) {
if(data[i].equals(e))
return i;
}
return -1;
}
public E remove (int index) {
if(index < 0 || index >= size)
throw new IllegalAccessError("Remove failed. Index is illegal.");
E ret = data[index];
for (int i = index + 1; i < size; i ++)
data[i - 1] = data[i];
size --;
data[size] = null;
if(size == data.length/2)
resize (data.length/2) ;
return ret;
}
public E removeFirst() {
return remove(0);
}
public E removeLast() {
return remove(size - 1);
}
public void removeElement(E e) {
int index = find(e);
if(index != -1)
remove(index);
}
@Override
public String toString() {
StringBuilder res = new StringBuilder();
res.append(String.format("Array: size = %d , capacity = %d\n",size, data.length));
res.append('[');
for (int i = 0 ; i < size ; i ++) {
res.append(data[i]);
if(i != size - 1)
res.append(",");
}
res.append(']');
return res.toString();
}
private void resize(int newCapacity) {
@SuppressWarnings("unchecked")
E[] newData = (E[])new Object[newCapacity];
for (int i = 0; i < size; i++)
newData[i] = data[i];
data = newData;
}
}