java单链表的添加、插入、删除

package nodelist;

public class LinkListTest {

public Node head =new Node();// 定义一个头节点

public LinkListTest() {

}

/**

* 添加一个节点

* 

* @param data

*/

public void addNode(int data) {

Node node = new Node(data);

Node temp = head;

while (temp.next !=null) {

temp = temp.next;

}

temp.next = node;

}

/**

* 插入某位置节点

* 

* @param index

* @param node

*/

public void insertNodeByIndex(int index, Node node) {

if (index < 1 || index > getListLength()) {

System.out.println("插入位置不合法");

return;

}

Node temp = head;

int length = 1;// 记录光标位置

while (temp.next !=null) {

if (index == length) {

// 找到要插入的位置,进行插入操作，

node.next = temp.next;

temp.next = node;

} else {

temp = temp.next;

}

length++;

}

}

/**

* 删除某位置的节点

* 

* @param index

*/

public void deleteNodeByIndex(int index) {

if (index < 1 || index > getListLength()) {

System.out.println("删除位置不合法");

}

Node temp = head;

int length = 1;

while (temp.next !=null) {

if (index == length) {

temp.next = temp.next.next;

return;

} else {

temp = temp.next;

}

length++;

}

}

public int getListLength() {

int length = 0;

Node temp = head;

while (temp.next !=null) {

length++;

temp = temp.next;

}

return length;

}

/**

* 查找所有的节点

*/

public void displayAllNodes() {

Node temp = head;

while (temp.next !=null) {

temp = temp.next;

System.out.println(temp.data);

}

}

/**

* @param args

*/

public staticvoid main(String[] args) {

LinkListTest list = new LinkListTest();

list.addNode(1);

list.addNode(2);

list.addNode(3);

list.insertNodeByIndex(1, new Node(10));

list.displayAllNodes();

System.out.println("--------------");

list.deleteNodeByIndex(1);

list.displayAllNodes();

// System.out.println(list.getListLength());

}

}