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Java多线程实现线程交互式访问问题

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悬赏园豆:5 [已解决问题] 解决于 2012-06-09 13:54

以下是用Eclipse编写的2个Java文件中的类:

1、threaddemo.java文件:

package demo.java.threaddemo;

public class ThreadDemo01 {
 public static void main(String[] args) {
  MyThread t1 = new MyThread("线程A");
  MyThread t2 = new MyThread("线程B");
  t1.start();
  t2.start();    
 }

}

2、MyThread.java文件

package demo.java.threaddemo;

public class MyThread extends Thread{
 private String name;
 
 public MyThread(String name){
  this.name = name;  
 }
 
 public void run(){//覆写run方法
  for(int i = 0;i < 50;i++){
   System.out.println("Thread运行: " + name + ",i = " + i);
  }
  
 }

}

 

但是运行结果总是:

Thread运行: 线程A,i = 0
Thread运行: 线程A,i = 1
Thread运行: 线程A,i = 2
Thread运行: 线程A,i = 3
Thread运行: 线程A,i = 4
Thread运行: 线程A,i = 5
Thread运行: 线程A,i = 6
Thread运行: 线程A,i = 7
Thread运行: 线程A,i = 8
Thread运行: 线程A,i = 9
Thread运行: 线程A,i = 10
Thread运行: 线程A,i = 11
Thread运行: 线程A,i = 12
Thread运行: 线程A,i = 13
Thread运行: 线程A,i = 14
Thread运行: 线程A,i = 15
Thread运行: 线程A,i = 16
Thread运行: 线程A,i = 17
Thread运行: 线程A,i = 18
Thread运行: 线程A,i = 19
Thread运行: 线程A,i = 20
Thread运行: 线程A,i = 21
Thread运行: 线程A,i = 22
Thread运行: 线程A,i = 23
Thread运行: 线程A,i = 24
Thread运行: 线程A,i = 25
Thread运行: 线程A,i = 26
Thread运行: 线程A,i = 27
Thread运行: 线程A,i = 28
Thread运行: 线程A,i = 29
Thread运行: 线程A,i = 30
Thread运行: 线程A,i = 31
Thread运行: 线程A,i = 32
Thread运行: 线程A,i = 33
Thread运行: 线程A,i = 34
Thread运行: 线程A,i = 35
Thread运行: 线程A,i = 36
Thread运行: 线程A,i = 37
Thread运行: 线程A,i = 38
Thread运行: 线程A,i = 39
Thread运行: 线程A,i = 40
Thread运行: 线程A,i = 41
Thread运行: 线程A,i = 42
Thread运行: 线程A,i = 43
Thread运行: 线程A,i = 44
Thread运行: 线程A,i = 45
Thread运行: 线程A,i = 46
Thread运行: 线程A,i = 47
Thread运行: 线程A,i = 48
Thread运行: 线程A,i = 49
Thread运行: 线程B,i = 0
Thread运行: 线程B,i = 1
Thread运行: 线程B,i = 2
Thread运行: 线程B,i = 3
Thread运行: 线程B,i = 4
Thread运行: 线程B,i = 5
Thread运行: 线程B,i = 6
Thread运行: 线程B,i = 7
Thread运行: 线程B,i = 8
Thread运行: 线程B,i = 9
Thread运行: 线程B,i = 10
Thread运行: 线程B,i = 11
Thread运行: 线程B,i = 12
Thread运行: 线程B,i = 13
Thread运行: 线程B,i = 14
Thread运行: 线程B,i = 15
Thread运行: 线程B,i = 16
Thread运行: 线程B,i = 17
Thread运行: 线程B,i = 18
Thread运行: 线程B,i = 19
Thread运行: 线程B,i = 20
Thread运行: 线程B,i = 21
Thread运行: 线程B,i = 22
Thread运行: 线程B,i = 23
Thread运行: 线程B,i = 24
Thread运行: 线程B,i = 25
Thread运行: 线程B,i = 26
Thread运行: 线程B,i = 27
Thread运行: 线程B,i = 28
Thread运行: 线程B,i = 29
Thread运行: 线程B,i = 30
Thread运行: 线程B,i = 31
Thread运行: 线程B,i = 32
Thread运行: 线程B,i = 33
Thread运行: 线程B,i = 34
Thread运行: 线程B,i = 35
Thread运行: 线程B,i = 36
Thread运行: 线程B,i = 37
Thread运行: 线程B,i = 38
Thread运行: 线程B,i = 39
Thread运行: 线程B,i = 40
Thread运行: 线程B,i = 41
Thread运行: 线程B,i = 42
Thread运行: 线程B,i = 43
Thread运行: 线程B,i = 44
Thread运行: 线程B,i = 45
Thread运行: 线程B,i = 46
Thread运行: 线程B,i = 47
Thread运行: 线程B,i = 48
Thread运行: 线程B,i = 49

也就是运行完一个线程后,在运行另一个线程,并没有实现交互式访问

请问我的程序哪里有问题 啊?

戈非的主页 戈非 | 初学一级 | 园豆:184
提问于:2012-06-09 02:51
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最佳答案
1

讲到多线程一般是为了实现资源共享,而线程如果要实现资源共享,继承Thread类是不能实现资源共享的,实现Runable接口就可以资源共享。下面我给出一个火车票卖票的例子为例说明多线程。

假如只有5张火车票,多三个售票点(三个线程)在卖票,这三个售票点都需要根据余票(资源)进行售票,只有再余票ticket>0的时候才可以卖票。那么就有一下的代码实例

SyncDemo1

public class SyncDemo1 {
    public static void main(String args[])
    {
        MyRunableThread1 mrt=new MyRunableThread1();
        Thread t1=new Thread(mrt,"t1");
        Thread t2=new Thread(mrt,"t2");
        Thread t3=new Thread(mrt,"t3");
        t1.start();
        t2.start();
        t3.start();
    }
}

MyRunableThread1

public class MyRunableThread1 implements Runnable {
    private int ticket = 5;

    @Override
    public void run() {
        // TODO Auto-generated method stub
        for (int i = 0; i < 100; i++)
            if (ticket > 0) {
                try {
                    Thread.sleep(300);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+"在卖票:剩余ticket=" + ticket--);
            }
    }
}

但是上面的多线程并没有实现同步,更多关于同步都可以看我整理的一篇博客

http://www.cnblogs.com/xwdreamer/archive/2011/11/20/2296931.html

收获园豆:5
xwdreamer | 初学一级 |园豆:144 | 2012-06-09 11:19
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