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Suppose you have 2 threads (Thread-1 on object1 and Thread-2 on object2). Thread-1 is in static synchronized method1(), can Thread-2 enter static synchronized method2() at same time?
Java Interview Questions and Answers (part 4)
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49. Suppose you have 2 threads (Thread-1 on object1 and Thread-2 on object2). Thread-1 is in static synchronized method1(), can Thread-2 enter static synchronized method2() at same time?
No, it might confuse you a bit that threads are created on different objects. But, not to forgot that multiple objects may exist but there is always one class’s class object lock available.
Here, when Thread-1 is in static synchronized method1() it must be holding lock on class class’s object and will release lock on class’s class object only when it exits static synchronized method1(). So, Thread-2 will have to wait for Thread-1 to release lock on class’s class object so that it could enter static synchronized method2().
Likewise, Thread-2 even cannot enter static synchronized method1() which is being executed by Thread-1. Thread-2 will have to wait for Thread-1 to release lock on class’s class object so that it could enter static synchronized method1()
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