# java实现单链表

public class Node {
protected Node next; //指针域
public  int data;//数据域

public Node( int data) {
this. data = data;
}

//显示此节点
public void display() {
System. out.print( data + " ");
}
}

public class LinkList {
public Node first; // 定义一个头结点
private int pos = 0;// 节点的位置

this.first = null;
}

// 插入一个头节点
Node node = new Node(data);
node.next = first;
first = node;
}

// 删除一个头结点,并返回头结点
public Node deleteFirstNode() {
Node tempNode = first;
first = tempNode.next;
return tempNode;
}

// 在任意位置插入节点 在index的后面插入
public void add(int index, int data) {
Node node = new Node(data);
Node current = first;
Node previous = first;
while (pos != index) {
previous = current;
current = current.next;
pos++;
}
node.next = current;
previous.next = node;
pos = 0;
}

// 删除任意位置的节点
public Node deleteByPos(int index) {
Node current = first;
Node previous = first;
while (pos != index) {
pos++;
previous = current;
current = current.next;
}
if (current == first) {
first = first.next;
} else {
pos = 0;
previous.next = current.next;
}
return current;
}

// 根据节点的data删除节点(仅仅删除第一个)
public Node deleteByData(int data) {
Node current = first;
Node previous = first; // 记住上一个节点
while (current.data != data) {
if (current.next == null) {
return null;
}
previous = current;
current = current.next;
}
if (current == first) {
first = first.next;
} else {
previous.next = current.next;
}
return current;
}

// 显示出所有的节点信息
public void displayAllNodes() {
Node current = first;
while (current != null) {
current.display();
current = current.next;
}
System.out.println();
}

// 根据位置查找节点信息
public Node findByPos(int index) {
Node current = first;
if (pos != index) {
current = current.next;
pos++;
}
return current;
}

// 根据数据查找节点信息
public Node findByData(int data) {
Node current = first;
while (current.data != data) {
if (current.next == null)
return null;
current = current.next;
}
return current;
}
}

public class TestLinkList {
public static void main(String[] args) {
}