Skip to main content

inheritance in java



  • Inheritance allows a software developer to derive a new class from an existing one
  • The existing class is called the parent class, or super class, or base class
  • The derived class is called the child class or subclass.
  • As the name implies, the child inherits characteristics of the parent
  • That is, the child class inherits the methods and data defined for the parent class
  • To tailor a derived class, the programmer can add new variables or methods, or can modify the inherited ones
  • Software reuse is at the heart of inheritance
  • By using existing software components to create new ones, we capitalize on all the effort that went into the design, implementation, and testing of the existing software
  • Inheritance relationships often are shown graphically in a UML class diagram, with an arrow with an open arrowhead pointing to the parent class




Examples 
ex 1 

ex 2


Comments

Post a Comment

Popular posts from this blog

Polymorphism and Dynamic Binding

Polymorphism: One piece of code works with all shape objects. Dynamic binding: How polymorphism is implemented Take previous Shape class hierarchy  remove inheritance  remove general and abstract class Shape 
3 comments
Read more

Generalization and Specialization

Generalization creates a concept with a broader scope. Specialization creates a concept with a narrower scope. Reusing the interface!  Inheritance: get the interface from the general class. Objects related by inheritance are all of the same type.
Post a Comment
Read more

History of Java

1990 Oak (interactive television, big failure) 1994 Java (for the Internet) Main feature: "Write Once, Run Any Where" => wrap the operating system so they all look the same Designed for A fresh start (no backward compatibility) “Pure” OOP: C++ Syntax, Smalltalk style Improvements over C++ much harder to write a bad program  Internet programming Very hard to create a virus  Run in a web browser (and at the server) There is a speed issue (from Java 1.3 and up much better) C# Microsoft's “Java-Killer” project release 2001 Language very similar to Java   Commen-Language Runtime (CLR) supports 30+ languages  
1 comment
Read more