Может тут кто то сможет помочь с методом join в мультипоточности

public class Solution {
    public static void main(String[] args) throws InterruptedException {
        Mouse alpha = new Mouse("#1");
        Mouse mouse1 = new Mouse("#2");
        Mouse mouse2 = new Mouse("#3");
        alpha.start();
        alpha.join();
        mouse1.start();
        mouse2.start();
    }

    private static void eat() {
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
        }
    }

    public static class Mouse extends Thread {
        public Mouse(String name) {
            super(name);

        }

        public void run() {
            System.out.println(getName() + " is starting to eat");
            eat();
            System.out.println(getName() + " has finished eating");
        }
    }
}

#1 is starting to eat
#1 has finished eating
#2 is starting to eat
#3 is starting to eat
#2 has finished eating
#3 has finished eating