TA的每日心情 | 开心 2021-3-12 23:18 |
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签到天数: 2 天 [LV.1]初来乍到
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一、链表的节点类
- package com.cache;
- public class LinkedListNode {
- public LinkedListNode previous;//前一节点
- public LinkedListNode next;//后一节点
- public Object object;//节点中的数据
-
-
-
- public LinkedListNode(Object object, LinkedListNode next,
- LinkedListNode previous)
- {
- this.object = object;
- this.next = next;
- this.previous = previous;
- }
-
- public void remove() {//从链表中移去
- previous.next = next;
- next.previous = previous;
- }
-
-
- public String toString() {
- return object.toString();
- }
- }
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二、链表类
- package com.cache;
- import java.util.*;
- public class LinkedList {
-
- private LinkedListNode head =
- new LinkedListNode("head", null, null);
-
- public LinkedList() {
- head.next = head.previous = head;//头节点
- }
-
- public LinkedListNode getFirst() {//返回头节点后的第一个节点
- LinkedListNode node = head.next;
- if (node == head) {
- return null;
- }
- return node;
- }
-
- public LinkedListNode getLast() {//返回最后一个节点
- LinkedListNode node = head.previous;
- if (node == head) {
- return null;
- }
- return node;
- }
- //将节点加到头节点后
- public LinkedListNode addFirst(LinkedListNode node) {
- node.next = head.next;
- node.previous = head;
- node.previous.next = node;
- node.next.previous = node;
- return node;
- }
-
- public LinkedListNode addFirst(Object object) {
- LinkedListNode node =
- new LinkedListNode(object, head.next, head);
- node.previous.next = node;
- node.next.previous = node;
- return node;
- }
- //节点添加到链表最后
- public LinkedListNode addLast(Object object) {
- LinkedListNode node =
- new LinkedListNode(object, head, head.previous);
- node.previous.next = node;
- node.next.previous = node;
- return node;
- }
-
- public void clear() {//清空链表
- //Remove all references in the list.
- LinkedListNode node = getLast();
- while (node != null) {
- node.remove();
- node = getLast();
- }
- //Re-initialize.
- head.next = head.previous = head;
- }
- public String toString() {
- LinkedListNode node = head.next;
- StringBuffer buf = new StringBuffer();
- while (node != head) {
- buf.append(node.toString()).append(", ");
- node = node.next;
- }
- return buf.toString();
- }
- }
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