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Which of these declarations will NOT compile?

  • A.void update() { synchronized (this) { } }
  • B.synchronized Thread() { }
  • C.synchronized void update() { }
  • D.static synchronized void reset() { }

Answer: B

A constructor cannot be declared synchronized, because no other thread can reach the object until construction finishes. Instance methods, static methods and blocks may all carry the keyword. A synchronized block inside a constructor is legal if a lock is genuinely needed.

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