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

There are two types of threads user and daemon. So if you want your program to exit make your thread a daemon.

Example

Thread t = new Thread();
t.setDaemon(true);

The process terminates when there are no more user threads.

To your second Question:

Join is to be used only when you need to ensure that the thread dies & you have nothing to do after that

Synchronization is for inter-thread-communication