Programming Tips - How should I setup a flag variable to tell a thread to stop?

Date: 2015sep17 Language: Java Q. How should I setup a flag variable to tell a thread to stop? A. There are two ways: volatile and AtomicBoolean. If only the parent thread sets the flag then volatile is ok. Declare like this:
volatile boolean vbKeepRunning = true;
AtomicBoolean abKeepRunning = new AtomicBoolean(true);