Java — Synchronization FAQs | Code Factory

  • Synchronized is a modifier, applicable for methods, blocks but not for variables and classes.
  • We can resolve data inconsistancy problems.
  • In increase waiting time of threads and creates performance problems.
  • If multiple threads are operating simultaneously on same Java object then thare may be a chance of data inconsistancy problem this is called Race Condition. We can overcome this problem by using synchronized keyword.
  • Every object in Java has a unique lock which is nothing but object lock. Whenever thread wants to execute Synchronized method on instance then the thread requires object lock.
  • Every class in Java has a unique lock which is nothing but class level lock. Whenever if a Thread wants to execute static Synchronized method then the thread requires this lock.
  • If a Thread wants to execute static Synchronized method then class level lock is required. If a Thread wants to execute instance Synchronized method then object level lock is required.
  • No
  • Performance improve, waiting time of thread will be reduced.
  • Yes, of course from different objects.
class X {
public synchronized void m1() {
// Here thread has lock of x object
Y y = new Y();
synchronized(y) {
// Here thread has lock of x and y object
Z z = new Z();
synchronized(z) {
// Here thread has lock of x, y and z object
}
}
}
}
  • The statements presents in synchronized method and synchronized block are called synchronized statements.

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