线程的一些方法 取名啥的

public class ThreadDemo1 {
    public static void main(String[] args) {
        Thread mt1 = new MyThread("1号");
        //mt1.setName("一号线程");
        mt1.start();

        Thread mt2 = new MyThread("2号");
        //mt2.setName("一号线程");
        mt2.start();

        //哪个线程执行它, 他就得到哪个线程对象(当前线程对象)
        //主线程的名称叫 main
        Thread m = Thread.currentThread();
        System.out.println(m.getName());
        for (int i = 0; i<5; i++){
            System.out.println(m.getName()+i);
        }
    }
}
class MyThread extends Thread{
    public MyThread(String name) {
        //为当前线程对象设置名称, 送给父类的有参构造器初始化名称
        super(name);
    }
    @Override
    public void run() {
        for (int i = 0; i<5; i++){
            System.out.println(Thread.currentThread().getName()+i);
        }
    }
}

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public class ThreadDemo02 {
    public static void main(String[] args) throws Exception{
        for (int i = 1; i <= 5; i++) {
            System.out.println("输出"+ i);
            if (i == 3){
                //让线程进入休眠状态
                Thread.sleep(3000);
            }
        }
    }
}