Why suspend() and resume() methods are deprecated?

Java Interview Questions and Answers (part 4)

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25. Why suspend() and resume() methods are deprecated?

Suspend() method is deadlock prone. If the target thread holds a lock on object when it is suspended, no thread can lock this object until the target thread is resumed. If the thread that would resume the target thread attempts to lock this monitor prior to calling resume, it results in deadlock formation.
These deadlocks are generally called Frozen processes.

Suspend() method puts thread from running to waiting state. And thread can go from waiting to runnable state only when resume() method is called on thread. It is deprecated method.

Resume() method is only used with suspend() method that’s why it’s also deprecated method.

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Other Interview Questions

• Mention some guidelines to write thread safe code, most important point we must take care of in multithreading programs?
• What is significance of using ThreadLocal?
• What is addShutdownHook method in java?
• Why suspend() and resume() methods are deprecated?
• How can you ensure all threads that started from main must end in order in which they started and also main should end in last?
• Suppose you have thread and it is in synchronized method and now can thread enter other synchronized method from that method?
• Differences and similarities between yield() and sleep() ?
• Output question 10.
• Difference between wait() and sleep() ?
• Suppose you have thread and it is in static synchronized method and now can thread enter other non static synchronized method from that method?
• More...