//MyThread线程

class MyThread extends Thread {

    String name;

    String sign;

    //Alt+Insert,Constructor 快速创建MyThread线程的构造方法

    public MyThread(String name, String sign) {

        this.name = name;

        this.sign = sign;

    }

    public void run() {//线程要执行的任务

        System.out.println(name + ":" + sign);

    }

}

public class Demo {

    public static void main(String[] args) {

        for (int i = 0; i < 10; i++) {

            MyThread m1 = new MyThread("加", "+");//调用构造方法

            MyThread m2 = new MyThread("减", "-");

            MyThread m3 = new MyThread("乘", "×");

            MyThread m4 = new MyThread("除", "÷");

//线程优先级1-10,10优先级最高

            m1.setPriority(1);

            m2.setPriority(4);

            m3.setPriority(7);

            m4.setPriority(10);

//启动线程

            m1.start();

            m2.start();

            m3.start();

            m4.start();

        }

    }

}