Proficient in Java multi-threaded learning (6) join, thread priority

The join method can be used to temporarily join thread execution. When thread A executes the join() method of thread B, A will wait. Waiting for B threads to finish executing, A will execute.

class Join implements Runnable{
    @Override
    public void run() {
        for (int i = 0; i < 60; i++) {
            System.out.println(Thread.currentThread().getName()+"...."+i);
        }
    }
}

public class JoinDemo {
    public static void main(String[] args) throws InterruptedException {
       Join join = new Join();
       Thread t1 = new Thread(join);
       Thread t2 = new Thread(join);

       t1.start();
       t2.start();
       t1.join();


        for (int i = 0; i < 60; i++) {
            System.out.println("main......");
        }
        System.out.println("over");
    }
}

The main thread will only be executed after thread 0 has finished executing. It has nothing to do with whether t2 is executed or not.

Thread priority:

The priority of the thread is 5 by default and can be viewed by printing Thread.currentThread(). The lowest priority of the thread is 1 (Thread.MIN_PRIORITY) and the highest is 10 (Thread.MAX_PRIORITY); the higher the priority, the easier it is to get the execution right of the cpu .