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java多线程笔试题---所有线程func1()执行完了,再执行func2()的实现

时间:2015-10-15 15:39:02      阅读:213      评论:0      收藏:0      [点我收藏+]

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1.问题描述:

  某个类有2个方法func1(),func2(),有threadCount个线程,要求所有线程执行完func1(),再执行func2()。

2.分析:

  1)所有线程的func1()执行完的标准是什么?

  2)线程之间怎样共享变量?

3.代码实现

  1)源代码:

/**
 * 
 */
package com.sunny.www.interview;

import java.util.concurrent.atomic.AtomicInteger;

/**
 * 所有线程执行完方法1,再执行方法2
 * @author sunny
 *
 */
public class Syn2Threads implements Runnable {
    private AtomicInteger threadCount;        
    
    public Syn2Threads(AtomicInteger threadCount) {
        super();
        this.threadCount = threadCount;
    }
    public AtomicInteger getThreadCount() {
        return threadCount;
    }
    public void setThreadCount(AtomicInteger threadCount) {
        this.threadCount = threadCount;
    }
    private void func1(){
        System.out.println(Thread.currentThread().getName() + " execute func1,threadCount=" + threadCount.decrementAndGet());
        
    }
    private void func2(){
        System.out.println(Thread.currentThread().getName() + " execute func2,threadCount=" + threadCount);
    }
    
    @Override
    public void run() {
        func1();
        synchronized(threadCount){
            while (0 < threadCount.get())  {
                try {
                    System.out.println(Thread.currentThread().getName() + " func1 not finished totally,threadCount=" + threadCount);
                    threadCount.wait();                    
                } catch (InterruptedException e) {
                    System.out.println(Thread.currentThread().getName() + " wait error");
                }
            }
            threadCount.notifyAll();
        }
        func2();
    }

    public static void main(String[] args) {
        int threadCount = 5;
        Syn2Threads syn2Threads = new Syn2Threads(new AtomicInteger(threadCount));
        for(int i = 1; i <= threadCount; i++){
            new Thread(syn2Threads,"thread-" + i).start();
        }
    }

}

  2)运行效果:

thread-2 execute func1,threadCount=4
thread-2 func1 not finished totally,threadCount=3
thread-1 execute func1,threadCount=3
thread-4 execute func1,threadCount=2
thread-4 func1 not finished totally,threadCount=2
thread-1 func1 not finished totally,threadCount=2
thread-5 execute func1,threadCount=1
thread-5 func1 not finished totally,threadCount=1
thread-3 execute func1,threadCount=0
thread-3 execute func2,threadCount=0
thread-5 execute func2,threadCount=0
thread-1 execute func2,threadCount=0
thread-4 execute func2,threadCount=0
thread-2 execute func2,threadCount=0

 

java多线程笔试题---所有线程func1()执行完了,再执行func2()的实现

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原文地址:http://www.cnblogs.com/sunny08/p/4882290.html

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