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DeleteNodeInList.java

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package _18;

import structure.ListNode;

public class DeleteNodeInList {

public static ListNode<Integer> deleteNode(ListNode<Integer> head, ListNode<Integer> node) {

if (head == null) {

return null;

}

if (node == head) {

ListNode<Integer> next = head.next;

head = null;

return next;

}

if (node.next != null) {

ListNode<Integer> next = node.next;

node.val = next.val;

node.next = next.next;

next = null;

} else {

ListNode<Integer> p = head;

while (p.next != node) {

p = p.next;

}

p.next = null;

node = null;

}

return head;

}

public static void main(String[] args) {

ListNode<Integer> head = new ListNode<Integer>(1);

ListNode<Integer> node2 = new ListNode<Integer>(2);

ListNode<Integer> node3 = new ListNode<Integer>(3);

head.next = node2;

node2.next = node3;

System.out.println(head);

head = deleteNode(head, head);

System.out.println(head);

head = deleteNode(head, node2);

System.out.println(head);

head = deleteNode(head, node3);

System.out.println(head);

}

}