java多线程执行顺序问题

Question

怎么让以下代码是按顺序输出的？

public class Main3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new MyThread(1).start();
        new MyThread(2).start();
        new MyThread(3).start();
        new MyThread(4).start();
        new MyThread(5).start();
        new MyThread(6).start();
        new MyThread(7).start();
    }

}

class MyThread extends Thread {

    private int i = 0;

    public MyThread(int i){
        this.i = i;
    }

    @Override
    public void run() {
        System.out.println(i);
    }
}

Answer 1

用join（）函数？
MyThread my = new MyThread(1)
my.start();
my.join() ;