13：在O（1）时间内删除单向链表中的一个节点

public class deleteInode {

public static void main(String[] args) {
ListNode head = new ListNode(0);
ListNode node1 = new ListNode(1);
ListNode node2 = new ListNode(2);
ListNode node3 = new ListNode(3);
head.setNext(node1);
node1.setNext(node2);
node2.setNext(node3);
delete(head,node2);
printListNode(head);

}
public static void delete(ListNode head,ListNode target){
if(head==null||target==null){
return;
}
if(head.getNext()==null){
if(head==target){
head=null;
}else{
return;
}
}
if(target.getNext()==null){
ListNode currentNode = head;
while(currentNode.getNext()!=null){
currentNode = currentNode.getNext();
}
currentNode.setNext(null);
}
if(target.getNext()!=null){
target.setValue(target.getNext().getValue());
if(target.getNext().getNext()!=null){
target.setNext(target.getNext().getNext());
}else{
target.setNext(null);
}
}
}
public static void printListNode(ListNode head){
ListNode current = head;
while(current!=null){
System.out.println(current.getValue()+"...");
current = current.getNext();
}
}

}