When does the main thread stop in Java?

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The program terminates when all non-daemon threads die (a daemon thread is a thread marked with setDaemon(true); it’s usually used for utility threads). From the documentation:

When a Java Virtual Machine starts up, there is usually a single non-daemon thread (which typically calls the method named main of some designated class). The Java Virtual Machine continues to execute threads until either of the following occurs:

  • The exit method of class Runtime has been called and the security manager has permitted the exit operation to take place.
  • All threads that are not daemon threads have died, either by returning from the call to the run method or by throwing an exception that propagates beyond the run method.

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