queue.java

来自「图论中关于简单无向图的深度」· Java 代码 · 共 52 行

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class Queue {
  private class QueueNode {

                                 public int  data;
                                 public  QueueNode link;
                 }
                 public QueueNode front;
                 public QueueNode rear;
                 public Queue() {
                                 front=null;
                                 rear=null;
                 }
                 public boolean isEmpty() {
                                 return (front==null);
                 }
                 public void ENQUEUE(int ne) {
                                 QueueNode newNode=new QueueNode();
                                 newNode.data=ne;
                                 newNode.link=null;
                                 if (front==null) {
                                                 front=newNode;
                                                 rear=newNode;
                                 } else {
                                                 rear.link=newNode;
                                                 rear=rear.link;
                                 }

                 }
                 public int DEQUEUE() {
                                 if(isEmpty()) {
                                                 return -1;
                                 }
                                 int temp=front.data;
                                 front=front.link;
                                 if(front==null) {
                                                 rear=null;
                                 }
                                 return temp;
                 }
         }