object synchronization

When a synchronized block is used for synchronization on an object instance, then threads co开发者_开发百科mpete to get into object's implicit monitor. And once, any particular thread enters into the monitor, any other thread has to wait for entering into it. Then

synchronized(object){
  // some code here
  // no function call
}

must not enforce taking any particular type of object. Thus any object type can be used here because every object has its implicit monitor.

Kindly reply me is it true?

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Yes, every Java Object can act as a monitor.

And since this is such a short answer, for bonus, this is an interesting read: Does the JVM create a mutex for every object in order to implement the 'synchronized' keyword? If not, how?

Also note that C# does something similar with their objects, but also have value types (which are not Monitors)

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Just keep in mind that if you have a variable that is null, you cannot lock it. Also, while things like Integer are objects, an int or float is not. You can lock an Integer or int[], but not an int.