Java – what are the uses of objects of type object

I saw the code below the exercise in the scjp book

Object obj = new Object();

First of all, I think this may be a mistake because I didn't use such a statement Now I understand that this is a valid statement

I just want to know the practical use of this, if any What can you do with an object of type object (instead of a class derived from object)?

Solution

This code declares a reference of object type and assigns it a newly assigned object instance

Now, instances of class object may seem meaningless But they do have practical uses One such use is locking:

...
synchronized (obj) {
   ...
}
...