执行start()的顺序不代表线程执行的顺序

import org.omg.CORBA.PUBLIC_MEMBER;
/**
 * Created by wuyupku on 2019-04-12 12:24
 *
 * @Beijing CHINA
 */
public class Demo01 {
    public static void main(String[] args) {
        mythread thread1 = new mythread(1);
        mythread thread2 = new mythread(2);
        mythread thread3 = new mythread(3);
        mythread thread4 = new mythread(4);
        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();
        System.out.println("运行结束");
    }
}
class mythread extends Thread{
    private int i;
    public mythread(int i){
        super();
        this.i = i;
    }
    @Override
    public void run(){
        super.run();
        System.out.println(i);
    }
}