Java Runnable vs Thread Quiz

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Best practices in Java concurrency

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Fernando Castillo

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Java Runnable vs Thread Quiz


Java Runnable vs Thread QuizVersión en línea Best practices in Java concurrency por Fernando Castillo 1 Why is it often preferred to implement Runnable rather than extend Thread in Java concurrency? a It decouples the task from its execution context and supports executors. b It automatically shares state between threads. c Extending Thread is faster but harder to maintain. d It prevents using synchronized blocks. e Runnable overrides can’t be tested. 2 What is a key benefit of using Runnable when designing concurrent tasks? a It makes the task immune to synchronization issues. b It compiles to native code. c It automatically creates a dedicated OS thread. d It prevents memory leaks. e You can reuse the same task with different threads or executors. 3 Which statement is true about single inheritance in Java related to Runnable vs Thread? a Implementing Runnable allows extending another class, unlike extending Thread. b Both allow extending multiple classes. c Runnable cannot be implemented with generics. d Thread implements Runnable by default. e Both prevent using interfaces. 4 Which approach aligns better with Java's Executor framework? a Implementing Runnable and submitting to an ExecutorService. b Wrapping Thread in a Runnable is required. c Creating anonymous Thread subclasses only. d Using Thread.suspend() e Extending Thread and calling start() 5 What is a potential downside of extending Thread? a Threads are automatically pooled. b It reduces thread safety. c It avoids synchronization issues. d You are tied to a specific class hierarchy and can’t extend another class. e It makes the code run faster by default. 6 Can a shared Runnable be executed by a thread pool? a Executors ignore Runnable objects. b Only one Thread can run a Runnable at a time. c No, a Runnable cannot be reused. d Runnable must be wrapped in a Thread before use. e Yes, by submitting the Runnable to an ExecutorService or wrapping in a Thread. 7 Which practice improves testability and modularity for concurrent tasks? a Using synchronized blocks exclusively. b Avoiding interfaces in concurrency code. c Embedding thread code in main() d Decoupling the task logic from the thread by using Runnable. e Extending Thread for each task. 8 When you need to run short-lived tasks, which is typically better? a Always create new Thread per task. b Use Runnable with a thread pool instead of creating new Thread objects. c Always extend Thread for clarity. d Use Thread.yield() to manage tasks. e Don’t use concurrency at all. 9 Which scenario demonstrates best practice for concurrency design? a Synchronize all Runnable.run() methods. b Create new Thread objects for trivial tasks. c Subclass Thread for each job. d Pass a Runnable to an ExecutorService instead of subclassing Thread. e Use a Runnable without an executor.

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Java Runnable vs Thread QuizVersión en línea

por Fernando Castillo

Why is it often preferred to implement Runnable rather than extend Thread in Java concurrency?

What is a key benefit of using Runnable when designing concurrent tasks?

Which statement is true about single inheritance in Java related to Runnable vs Thread?

Which approach aligns better with Java's Executor framework?

What is a potential downside of extending Thread?

Can a shared Runnable be executed by a thread pool?

Which practice improves testability and modularity for concurrent tasks?

When you need to run short-lived tasks, which is typically better?

Which scenario demonstrates best practice for concurrency design?