java实现双向循环链表

public class DoubleNode {
	
DoubleNode pre = this;  //前一个节点 -- 指向自己
DoubleNode next = this; //下一个节点 -- 指向自己
int data;

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

//获取数据
public int getData() {
	return this.data;
}

//查看下一个节点
public DoubleNode next() {
	return this.next;
}

//查看上一个节点
public DoubleNode pre() {
	return this.pre;
}

//追加节点
public void insert(DoubleNode node){
	DoubleNode nextNext = next;
	this.next = node;
	node.pre = this;
	node.next = nextNext;
	nextNext.pre = node;
  }
 }