class CalcPrimes{    public static void main(String args[])    {        PrimeRunnable primes=new PrimeRunnable();        Thread t1;        //將新建的類的實例作為參數(shù)傳遞給Thread類的構(gòu)造方法，并給新建的線程一個名字        t1 = new Thread(primes,"primes");        //調(diào)度這個線程使之由新建狀態(tài)變成可運行狀態(tài)        t1.start();        while(t1.isAlive())        {            System.out.println(Thread.currentThread().getName()+":計算素數(shù)..."+"\n");            try            {                    //睡眠當前線程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;            //每判斷一個數(shù)是否是素數(shù)以后，都要主動睡眠一次            try            {                Thread.sleep(500);            }            catch(InterruptedException e)            {                return;            }        }    }}