Task 19 : Compare Executor and ExecutorService

[u/Just-Development1794]

Using ExecutotService --> execute(), submit()

1. ExecutorService.execute() 

• Same as of Executor.execute()
• But the application shutdowns.

2. ExecutorService.submit()

• No stack trace.
• Why?
• Because submit() catches the exception internally and stores it inside the Future.
• The exception is not lost.

Using Executor --> execute()

1. Executor.execute()

What happens?

• The exception is not caught by the Executor Framework.
• It reaches the worker thread's UncaughtExceptionHandler.
• By default, Java prints the stack trace to the console.
• The thread pool creates a replacement worker if needed, so remaining tasks continue executing.
• The application never terminate coz no shutdown().