Discussion :: Threads
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Which statement is true?
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A.
A static method cannot be synchronized.
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B.
If a class has synchronized code, multiple threads can still access the nonsynchronized code.
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C.
Variables can be protected from concurrent access problems by marking them with the synchronized keyword.
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D.
When a thread sleeps, it releases its locks.
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Answer : Option B
Explanation :
B is correct because multiple threads are allowed to enter nonsynchronized code, even within a class that has some synchronized methods.
A is incorrect because static methods can be synchronized; they synchronize on the lock on the instance of class java.lang.Class that represents the class type.
C is incorrect because only methods—not variables—can be marked synchronized.
D is incorrect because a sleeping thread still maintains its locks.
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