java倒计时简易实现，只按单线程，以秒为单位

public class Countdown {
    private int lin;
    public Countdown(int lin)throws InterruptedException{
        this.lin = lin;
        System.out.println("最后倒数时刻：" + lin + "秒" + "\n");
        while (lin > 0){
            System.out.println("倒计时: "+ --lin +"秒");
            TimeUnit.SECONDS.sleep(1);
        }
        System.out.println("Game over！！！");
    }

    public static void main(String[] args) throws InterruptedException{
        new Countdown(30);
    }
}