Synchronization on “this” or private Object in Java? [duplicate]

Answer 1

I would say the second method is better. Consider the following situation:

public class Abc{

    private int someVariable;

    public class Xyz {
        //some method,synchronize on this
    }

        //some method, and again synchronize on this


}

In this situation this is not the same in the two methods. One is a method of the inner class. Hence, it is better to use a common object for synchronization. E.g., synchronized (someVariable).