Synchronization method vs private final object for locking in java

Question

Can anyone tell me which one is better approach between synchronization method and private final object in java and why ??

public class kclass {

    private final Object myObject = new Object();

    public synchronized void show() {
       ...
    } 

    public void show1() {
        synchronized(myObject) {
            ...
        } 
    }
}

Answer 1

In general both approaches are legit. Using a dedicated object to synchronize on allows you to do more fine-grained synchronization than using synchronized on the method level: you may synchronize only part of a method or use different lock objects for different synchronization purposes. synchronized (non static) methods will implicitly synchronize on the object they are called on, so their whole body is synchronized.