While has-a represents composition, is-a represents inheritance.

In Java, the indirect superclass is any class above the direct superclass in the class hierarchy.

Every class in Java directly or indirectly inherits from (i.e. extends) object.

Inheritance is sometimes also referred to as specialization because the subclass exhibits the behaviors of its superclass and can add behaviors that are specific to the subclass.

For a superclass and a subclass, the constructors and static methods or fields will be inherited.

For a superclass and a subclass, the objects of your class will receive all of the state (fields) and behavior (methods) of the parent class.

An indirect superclass is any class above the direct superclass in the class hierarchy.