Suppose you have thread and it is in static synchronized method and now can thread enter other non static synchronized method from that method?

Java Interview Questions and Answers (part 4)

(Continued from previous question...)

46. Suppose you have thread and it is in static synchronized method and now can thread enter other non static synchronized method from that method?

Yes, here when thread is in static synchronized method it must be holding lock on class’s class object and when it enters synchronized method it will hold lock on object’s monitor as well.

So, now thread holds 2 locks (it’s also called nested synchronization)- first one on class’s class object.
second one on object’s monitor (This lock will be released when thread exits non static method).

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Other Interview Questions

• Is it important to acquire object lock before calling wait(), notify() and notifyAll()?
• Suppose you have 2 threads (Thread-1 on object1 and Thread-2 on object2). Thread-1 is in synchronized method1(), can Thread-2 enter synchronized method2() at same time?
• Output question 17.
• Differences and similarities between yield() and sleep() ?
• Output question 15.
• Suppose you have thread and it is in synchronized method and now can thread enter other synchronized method from that method?
• Can you again start Thread?
• Suppose you have thread and it is in synchronized method and now can thread enter other synchronized method from that method?
• Difference between notify() and notifyAll() methods, can you write a code to prove your point?
• Can you again start Thread?
• More...