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The finally block always executes when the try block exits. This ensures that the finally block is executed even if an unexpected exception occurs. But finally is useful for more than just exception handling — it allows the programmer to avoid having cleanup code accidentally bypassed by a return, continue, or break. Putting cleanup code in a finally block is always a good practice, even when no exceptions are anticipated.

finally block will execute EVERYTIME EXCEPT.... 1)before finally Block, JVM Shutdowns the existing Program anyhow 2) if there is unhandled exception in finally block. Eg:-System.exit(); .... simple as that
Even a return statement in any try - catch block will not stop the execution of finally block. (Tried and Tested :0 )

when there is System.exit() in the try block

In general, the process is killed somehow or there's an infinite loop.

If a catch clause invokes System.exit() the finally clause WILL NOT execute.

If you explicitly invoking exit(), static method of System Class inside try block then in this case it will not execute finally block and it will initiate process to shutdown JVM.