java-----循环链表

Posted 2021-09-17 小鹿可可乐

循环链表

• 1.单向循环链表
• • 1.1 代码实现
• 2.双向循环链表

1.单向循环链表

1.1 代码实现

List：

public interface List<E> {
    void addHead(E value);
    void addTail(E value);
    void removeHead();
    void removeTail();
    void removeValue(E value);
    boolean contains(E value);
    void change(E srcValue,E aimValue);

    void show();
}

import src11.List;
import src11.SingleLink;

public class SingleCircleLink<T extends Comparable<T>> implements List<T> {
    private Node<T> head;
    private Node<T> tail;
    private int size;

    @Override
    public void addHead(T value) {
        Node<T> node = new Node<>(value);
        if(size == 0){   //链表为空
            head = node;
            tail = node;
            size++;
        }else{

            node.next = head;//新节点的下一个指向头
            head = node;//更新新头节点指向
            tail.next = head;//尾部next指向新头部位置
            size++;
        }
    }

    @Override
    public void addTail(T value) {
        Node<T> node = new Node<>(value);
        if(size == 0){   //链表为空
            head = node;
            tail = node;
            size++;
        }else{
            tail.next = node;//尾部的下一个节点是node
            tail = node;//更新新尾部
            tail.next = head;//尾巴的下一个节点头布
            size++;
        }

    }

    @Override
    public void removeHead() {
        if(size == 0 ){
           return;
        }else if(size == 1){
            head = null;
            tail = null;
        }
        else {
            head = head.next;
            tail.next = head;
        }
        size--;
    }

    @Override
    public void removeTail() {

        if(size == 0){
            return;
        }else if(size == 1){
            head = null;
            tail = null;
        }else{
            Node<T> p = head;
            for(;p.next == tail;p = p.next){
                ;
            }
            tail = p;
            p.next = head;
        }
        size--;
    }

    @Override
    public void removeValue(T value) {
        if(size == 0){
            return;
        }else if(head.value.compareTo(value)==0){
            removeHead();
        }else if(tail.value.compareTo(value) == 0){
            removeTail();
        }
        else{   //多个节点
            Node<T> p = head;
            do {
                if (p.next.value.compareTo(value) == 0) {
                    p.next = p.next.next;
                    size--;
                }
                p = p.next;
            }while(p!=head);

        }
    }

    @Override
    public boolean contains(T value) {
        return false;
    }

    @Override
    public void change(T srcValue, T aimValue) {

    }

    @Override
    public void show() {

    }


    private static class Node<E>{
        E value;
        SingleCircleLink.Node<E> next;

        public Node(E value) {
            this.value = value;
            this.next = this;//当前节点next指向当前节点
        }
    }
 }

2.双向循环链表

尾删：

p = tail.prev;
p.next = head;
head.prev = p;
tail = p;

今天也要好好学习呀~