Java并发编程实例--3.打断一个线程

一般来讲一个java程序如果运行着多个线程，那么只有在这些线程都运行完毕后才会终止。

但有时候，我们需要去结束某个线程或者取消某个任务。此时就用到了Java线程的打断机制，即interruption。

本例中，我们将开发一个程序创建线程，5秒后将强制打断它。

PrimeGenerator.java

package com.dylan.thread.ch1.c03;

/**
 * @author xusucheng
 * @create 2018-04-22
 **/
public class PrimeGenerator extends Thread {
    @Override
    public void run() {
        long number = 1L;
        while (true){
            if(isPrime(number)){
                System.out.printf("Number %d is Prime.\n", number);
            }
            //判断是否被打断
            if(isInterrupted()){
                System.out.printf("The Prime Generator has been Interrupted");
                return;
            }
            number++;
        }
    }

    private boolean isPrime(long number){
        if(number<2){
            return true;
        }
        for (long i=2;i<number;i++){
            if((number%i)==0){
                return false;
            }
        }

        return true;
    }

}

Main.java

package com.dylan.thread.ch1.c03;

/**
 * @author xusucheng
 * @create 2018-04-22
 **/
public class Main {
    public static void main(String[] args) {
        Thread task = new PrimeGenerator();
        task.start();
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        task.interrupt();
    }
}

输出：

Number 1 is Prime.
Number 2 is Prime.
Number 3 is Prime.
Number 5 is Prime.

......

Number 82007 is Prime.
Number 82009 is Prime.
Number 82013 is Prime.
The Prime Generator has been Interrupted