Public object class

The Object class is the parent class of all the classes in java by default . In other words, it is the topmost class of java. The Object class is beneficial if you want to refer any object whose type you don’t know. Notice that parent class reference variable can refer the child class object, know as upcasting.

In object-oriented programming, a class is a blueprint for creating objects (a particular data structure), providing initial values for state (member variables or attributes), and implementations of behavior (member functions or methods) . The user-defined objects are created using the class keyword.