synchronized section inside constructor and syncronized constructor differences

Question

I noticed interesting behaviour:

I can write

class My {
     public My(){
        synchronized(this){
            // code
        }

    }  
}

but I cannot write

class My {
         public synchronized My(){
                // code
            }

        }  
    }

I thought that both constructions works identically terms java API.

Please clarify this misunderstanding.

Answer 1

In the first case, the object is almost created, only the body of the Constructor need to executed.

But, in the second case, there won't any object to synchronize.

Answer 2

It is impossible situation that two Threads will create same object !

Thus synchronized modificator hasn't sense for constructor.