How can thread run after main method closes?

Question

Here are my two classes:

public class Firstclass {
    public static void main(String args[]) throws InterruptedException {
        System.out.println(\"Main sta         


        

Answer 1

join If you have a thread B that can't do its work until another thread A has completed its work, then you want thread B to "join" thread A.

synchronized When we use threads, we usually need to use some synchronization somewhere to make sure our methods don't interrupt each other at the wrong time and mess up our data. Generally, any time more than one thread is accessing mutable (changeable) data, you synchronize to protect that data, to make sure two threads aren't changing it at the same time (or that one isn't changing it at the same time the other is reading it, which is also confusing).