关于#java#的问题，请各位专家解答！

class th extends  Thread{
    public void run() {
        for(int i=0;i<100;++i){
            try{

                final int i1 = 55;
                sleep(mills:i1;);
        }catch(InterruptedException e){
            e.printStackTrace();
        }
            if(i%3==0){
                System.out.println(currentThread().getName()+":"+i);
            }
            if(i%2==0){
             yield();
            }

        }
    }
    public th(String name){
        super(name);
    }
}

这多线程sleep方法为什么会报错，怎么把错误消除。

class th extends  Thread {
    @Override
    public void run() {
        for (int i = 0; i < 100; ++i) {
            try {

                final int i1 = 55;
                sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            if (i % 3 == 0) {
                System.out.println(currentThread().getName() + ":" + i);
            }
            if (i % 2 == 0) {
                Thread.yield();
            }

        }
    }

    public th(String name) {
        super(name);
    }
}

有帮助点个采纳把