calcprimes.java

jbuilder2005

class CalcPrimes
{
    public static void main(String args[])
    {
        PrimeRunnable primes=new PrimeRunnable();
        Thread t1;
        //将新建的类的实例作为参数传递给Thread类的构造方法，并给新建的线程一个名字
        t1 = new Thread(primes,"primes");
        //调度这个线程使之由新建状态变成可运行状态
        t1.start();
        while(t1.isAlive())
        {
            System.out.println(Thread.currentThread().getName()+":计算素数..."+"\n");
            try
            {
                    //睡眠当前线程0.5秒
                    Thread.sleep(500);
            }
            catch(InterruptedException e)
            {
                return;
            }
        }
    }
}
class PrimeRunnable implements Runnable
{
    public void run()
    {
        boolean flag = true;
        for(int number=3;;number++)
        {
            for(int i=2;i<number;i++)
            {
                if (number%i==0)
                {
                    flag = false;
                    break;
                }
            }
            if(flag)
                System.out.println(Thread.currentThread().getName()+": "+ number);
            flag = true;
            //每判断一个数是否是素数以后，都要主动睡眠一次
            try
            {
                Thread.sleep(500);
            }
            catch(InterruptedException e)
            {
                return;
            }
        }
    }
}