本文实例讲述了Java实现双链表互相交换任意两个节点的方法。分享给大家供大家参考,具体如下:
概述:
双向链表也叫双链表,是链表的一种,它的每个数据结点中都有两个指针,分别指向直接后继和直接前驱。所以,从双向链表中的任意一个结点开始,都可以很方便地访问它的前驱结点和后继结点。一般我们都构造双向循环链表。
思路:
1、确定两个节点的先后顺序
2、next、prev互相交换顺序以及将换向前方的节点与之前的节点对接。(1.prev.next = 2)
3、判断是否相邻
实现代码:
链表类:
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public class SLink { public SNode head; public SLink() { this .head = new SNode(); } public boolean interChangeById( int id1, int id2) { SNode s = head; SNode node1 = null ,node2 = null ; int node1Count,node2Count; node1Count = node2Count = 0 ; if (id1 == id2) { return true ; } /** * 向下遍历 */ while (s.next != null ) { s = s.next; node1Count ++ ; if (s.student.stuId == id1) { /** * 记录节点1 */ node1 = s; break ; } } s = head; while (s.next != null ) { s = s.next; node2Count ++ ; if (s.student.stuId == id2) { /** * 记录节点2 */ node2 = s; break ; } } if (node1 != null && node2 != null ) { SNode temp = new SNode(); /** * node1在后 */ if (node1Count > node2Count) { temp.next = node1.next; temp.prev = node1.prev; /** * 记录那个节点就先处理那个节点 * 1、交换next * 2、交换prev * 3、设置之前节点的next(对接) */ node1.next = node2.next; node1.prev = node2.prev; node2.prev.next = node1; if (node1.next.equals(node1)) { /** * 说明两个节点相邻 */ node1.next = node2; node2.next = temp.next; node2.prev = node1; } else { /** * 说明节点不相邻 */ node2.next = temp.next; node2.prev = temp.prev; temp.prev.next = node2; } } else { /** * node1在前 */ temp.next = node2.next; temp.prev = node2.prev; node2.next = node1.next; node2.prev = node1.prev; node1.prev.next = node2; if (node2.next.equals(node2)) { node2.next = node1; node1.next = temp.next; node1.prev = node2; } else { node1.next = temp.next; node1.prev = temp.prev; temp.prev.next = node1; } } return true ; } return false ; } public void displayStudent() { SNode s = head; while (s.next != null ) { s = s.next; System.out.println(s.student); } } } |
节点类:
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public class SNode { public Student student; public SNode next; public SNode prev; public SNode(Student student, SNode prev,SNode next) { this .student = student; this .next = next; this .prev = prev; } public SNode() { this .student = null ; this .next = null ; this .prev = null ; } } |
Student类:
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public class Student { public int stuId; public String name; public int age; public String className; public Student( int stuId, String name, int age, String className) { this .stuId = stuId; this .name = name; this .age = age; this .className = className; } public int getStuId() { return stuId; } public void setStuId( int stuId) { this .stuId = stuId; } public String getName() { return name; } public void setName(String name) { this .name = name; } public int getAge() { return age; } public void setAge( int age) { this .age = age; } public String getClassName() { return className; } public void setClassName(String className) { this .className = className; } @Override public String toString() { return "Student{" + "stuId=" + stuId + ", name='" + name + '\ '' + ", age=" + age + ", className='" + className + '\ '' + '}' ; } } |
希望本文所述对大家java程序设计有所帮助。
原文链接:http://blog.csdn.net/u010369338/article/details/71640467