java 实现自定义链表

java 实现自定义链表

Java  /  管理员 发布于 2020-03-08 13:33:15   54

1.链表结构

  链表是链式的结构


2.链表的组成

   链表是由头节点，中间节点和尾节点组成

   节点是由两个部分组成：

      1.数据域
      2.引用域


3.链表的实现

   Node{

      数据域

      引用域

   }

   MyLinkedList{

      记录元素总数的属性

      头节点属性

      head;

      尾节点属性

      trail;

     }
下面上代码

public class DoubleLinkedList{private static class Node {Object value;Node prev = this;Node next = this;Node(Object v) {value = v;}public String toString() {return value.toString();}}private Node head = new Node(null);// 头节点private int size;// 链表大小// 以下是接口方法public boolean addFirst(Object o) {addAfter(new Node(o), head);return true;}public boolean addLast(Object o) {addBefore(new Node(o), head);return true;}public boolean add(Object o) {return addLast(o);}public boolean add(int index, Object o) {addBefore(new Node(o), getNode(index));return true;}public boolean revise(int index, Object o) {reviseNode(new Node(o), getNode(index));return true;}public boolean remove(int index) {removeNode(getNode(index));return true;}public boolean removeFirst() {removeNode(head.next);return true;}public boolean removeLast() {removeNode(head.prev);return true;}public Object get(int index) {return getNode(index).value;}public int size() {return size;}public String toString() {StringBuffer s = new StringBuffer();Node node = head;for (int i = 0; i < size; i++) {node = node.next;if (i > 0)s.append("   ");s.append(node.value);}return s.toString();}private Node getNode(int index) {if (index < 0 || index >= size)System.out.println("错误");Node node = head.next;for (int i = 0; i < index; i++)node = node.next;return node;}private void addBefore(Node newNode, Node node) {newNode.next = node;newNode.prev = node.prev;newNode.next.prev = newNode;newNode.prev.next = newNode;size++;}private void reviseNode(Node newNode, Node node) {newNode.next = node.next;newNode.prev = node.prev;newNode.next.prev = newNode;newNode.prev.next = newNode;}private void addAfter(Node newNode, Node node) {newNode.prev = node;newNode.next = node.next;newNode.next.prev = newNode;newNode.prev.next = newNode;size++;}private void removeNode(Node node) {node.prev.next = node.next;node.next.prev = node.prev;node.prev = null;node.next = null;size--;}}