When does the main thread stop in Java?

Question

I read this statement:

The main thread must be the last thread to finish execution. When the main thread stops, the program terminates.

Answer 1

I read this statement: “The main thread must be the last thread to finish execution. When the main thread stops, the program terminates.”Is it true?

No, it is not. The virtual machine terminates if the last non-daemon thread has finished. It doesn't have to be the main thread.

Simple example:

public static void main(String[] args) {

   System.out.println("Main thread started");
   new Thread(new Runnable() {
     @Override
     public void run() {
        System.out.println("Second thread started");
        try {
          Thread.sleep(2000);  // wait two seconds
        } catch(Exception e){}
        System.out.println("Second thread (almost) finished");
     }
   }).start();
   System.out.println("Main thread (almost) finished");
}