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Java util concurrent Executor Framework (Why? Purpose? (to run the…

- - - - ways to delegate tasks for execution
        
        execute(Runnable)
        
        submit(Runnable)
        
        submit(Callable)
        
        invokeAny(...)
        
        invokeAll(...)
    - - to execute repeatedly with a fixed interval of time in between each execution
      - Schedule task after a delay
      - usage
        
        schedule (Callable task, long delay, TimeUnit timeunit)
        
        schedule (Runnable task, long delay, TimeUnit timeunit)
        
        scheduleAtFixedRate (Runnable, long initialDelay, long period, TimeUnit timeunit)
        
        scheduleWithFixedDelay (Runnable, long initialDelay, long period, TimeUnit timeunit)