java中如何完成倒计时

[zhjyym_java]

各位，小弟提些很无知的问题，怎么在java中提取系统时间，时间能相互加减吗？
我准备做一个倒计时，望各位多多指教。

[小李子]

System.currentTimeMillis()
或 new Date获取当前时间
时间可以加减运算

[zhjyym_java]

如果用Date的话，是有这个Date(int year, int month, int day)构造方法吗

[不善^]

刚网上看倒的

public class 倒计时时钟 {

    //小时
    private int hours;
    
    //分钟
    private int min;
    
    //秒
    private int second;
    
    public 倒计时时钟(int hours,int min,int second) {
        this.hours = hours;
        this.min = min;
        this.second = second;
    }

    public int getHours() {
        return hours;
    }

    public void setHours(int hours) {
        this.hours = hours;
    }

    public int getMin() {
        return min;
    }

    public void setMin(int min) {
        this.min = min;
    }

    public int getSecond() {
        return second;
    }

    public void setSecond(int second) {
        this.second = second;
    }

}




public class 倒计时 implements Runnable{

    private 倒计时时钟 clock;
    private long time;
    
    public 倒计时(倒计时时钟 clock) {
        this.clock = clock;
        //将时间换算成秒
        time = clock.getHours()*60*60+clock.getMin()*60+clock.getSecond();
    }

    public void run() {
        while(time >= 0) {
            try {
                Thread.sleep(1000);
                time -= 1;//时间减去一秒
                clock.setHours((int)time/(60*60));
                clock.setMin((int)(time/60)%60);
                clock.setSecond((int)time % 60);
                
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        //return clock;
    }
    
    public 倒计时时钟 getTime() {
        return clock;
    }
    
    public static void main(String [] args) {
        倒计时时钟 clock = new 倒计时时钟(0,10,0);
        
        倒计时 jishi = new 倒计时(clock);
        显示 show = new 显示(jishi.getTime());
        //显示 show = new 显示();
        new Thread(show).start();
        new Thread(jishi).start();
        
    }
}

    class 显示 implements Runnable {
        private 倒计时时钟 clock;
        public 显示(倒计时时钟 clock) {
            this.clock = clock;
            
        }
        
        public void run() {
            
            while(clock.getHours() != 0 || 
                    clock.getMin() != 0 || 
                    clock.getSecond() != 0) {
                try {
                    System.out.println(String.format("%02d",clock.getHours())+
                            ":"+String.format("%02d",clock.getMin())+
                            ":"+String.format("%02d",clock.getSecond()));
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            
        }
    }

[yxc0433]

Date过时了，用Calendar吧

[kadach11]

不明白你为何要在JAVA里做倒计时？计算显示的话用javascript就Ok，需要存储用数据库也行。

[阿彪兄]

支持 一下