Question

what is the difference between

public synchronized void addition()
{
   //something;
}

and

public void addtion()
{
     synchronized (//something)
     {
        //something;
     }
}

If I am wrong Ignore this question.

Answer 1

it the first one only one thread can execute whole method at a time whereas in second one only one thread can execute that synchronized block if not used this as parameter.

here is a duplicate of it Is there an advantage to use a Synchronized Method instead of a Synchronized Block?