链表的基本操作-Java
2017-09-12 12:02
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转载:http://blog.csdn.net/tayanxunhua/article/details/11100097/
package com.tyxh.link; //节点类 public class Node { protected Node next; //指针域 protected int data;//数据域 public Node( int data) { this. data = data; } //显示此节点 public void display() { System. out.print( data + " "); } } package com.tyxh.link; //单链表 public class LinkList { public Node first; // 定义一个头结点 private int pos = 0;// 节点的位置 public LinkList() { this. first = null; } // 插入一个头节点 public void addFirstNode( int data) { Node node = new Node(data); node. next = first; first = node; } // 删除一个头结点,并返回头结点 public Node deleteFirstNode() { Node tempNode = first; first = tempNode. next; return tempNode; } // 在任意位置插入节点 在index的后面插入 public void add(int index, int data) { Node node = new Node(data); Node current = first; Node previous = first; while ( pos != index) { previous = current; current = current. next; pos++; } node. next = current; previous. next = node; pos = 0; } // 删除任意位置的节点 public Node deleteByPos( int index) { Node current = first; Node previous = first; while ( pos != index) { pos++; previous = current; current = current. next; } if(current == first) { first = first. next; } else { pos = 0; previous. next = current. next; } return current; } // 根据节点的data删除节点(仅仅删除第一个) public Node deleteByData( int data) { Node current = first; Node previous = first; //记住上一个节点 while (current. data != data) { if (current. next == null) { return null; } previous = current; current = current. next; } if(current == first) { first = first. next; } else { previous. next = current. next; } return current; } // 显示出所有的节点信息 public void displayAllNodes() { Node current = first; while (current != null) { current.display(); current = current. next; } System. out.println(); } // 根据位置查找节点信息 public Node findByPos( int index) { Node current = first; if ( pos != index) { current = current. next; pos++; } return current; } // 根据数据查找节点信息 public Node findByData( int data) { Node current = first; while (current. data != data) { if (current. next == null) return null; current = current. next; } return current; } } package com.tyxh.link; //测试类 public class TestLinkList { public static void main(String[] args) { LinkList linkList = new LinkList(); linkList.addFirstNode(20); linkList.addFirstNode(21); linkList.addFirstNode(19); //19,21,20 linkList.add(1, 22); //19,22,21,20 linkList.add(2, 23); //19,22,23,21,20 linkList.add(3, 99); //19,22,23,99,21,20 linkList.displayAllNodes(); // Node node = linkList.deleteFirstNode(); // System.out.println("node : " + node.data); // linkList.displayAllNodes(); // node = linkList.deleteByPos(2); // System.out.println("node : " + node.data); // linkList.displayAllNodes(); // linkList.deleteFirstNode(); Node node = linkList.deleteByData(19); // Node node = linkList.deleteByPos(0); System. out.println( "node : " + nod 4000 e. data); linkList.displayAllNodes(); Node node1 = linkList.findByPos(0); System. out.println( "node1: " + node1. data); Node node2 = linkList.findByData(22); System. out.println( "node2: " + node2. data); } }
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