Terminating a Java Program

Question

I found out ways to terminate (shut-down or stop) my Java programs. I found two solutions for it.

1. using return;
   When I want to quit or

Answer 1

What does return; mean?

return; really means it returns nothing void. That's it.

why return; or other codes can write below the statement of System.exit(0);

It is allowed since compiler doesn't know calling System.exit(0) will terminate the JVM. The compiler will just give a warning - unnecessary return statement