Inheritance and Overriding Methods

Single Inheritance
• When a class inherits from only one class, it is called single inheritance.
• Interfaces provide the benefits of multiple inheritance without drawbacks.
• Syntax of a Java class is as follows:
A subclass can modify behavior inherited from a parent class.
• A subclass can create a method with different functionality than the parent’s method but with the same:
• Name
• Return type
• Argument list

Then the new method is said to override the old one.

So, what is the objective of subclass?
The Java programming language semantics dictate that p2.method () results in the child version of the method being executed, because the method is declared private, p2 ( declared as parent ) cannot access it , this the semantics language is violated


3. Invoking Overridden Methods
A subclass method may invoke a superclass method using the
super keyword:
• The keyword super is used in a class to refer to its superclass.
• The keyword super is used to refer to the members of superclass, both data attributes and methods.
• Behavior invoked does not have to be in the superclass; it can be further up in the hierarchy.