will main thread exit before child threads complete execution? [duplicate]

Answer 1

Once the main thread exits, it takes the children with it. Perhaps by "finish" the second article simply means no more operation other than waiting for the children. Once the main thread calls System.exit(0); it's over -- every body dies.

Say you have two threads running: threadA and threadB. in the main method. The first code is the nice way of terminating the thread -- just one of many ways:

 threadA.start();
 threadB.start();
 final long intercept = 300;
 long startTime = System.currentTimeMillis();
 while (threadA.isAlive() && mis.isAlive()) {
    threadA.join(intercept);
if (System.currentTimeMillis() - startTime > intercept) {
   threadB.interrupt();
   threadA.interrupt();
   threadA.join();
}
}
System.exit(0);

Below is an abrupt way of killing all threads from within main:

System.exit(0);