Abstract class,Abstract methods and classes

This page discusses - Abstract class,Abstract methods and classes

Abstract class,Abstract methods and classes

Abstract methods and classes

     

While going through the java language programming you have learned so many times the word abstract. In java programming language the word abstract is used with methods and classes. 

Abstract Method

An abstract method one that have the empty implementation. All the methods in any interface are abstract by default. Abstract method provides the standardization for the " name and signature" of any method. One can extend and implement to these methods in their own classes according to the requirements. 

  e.g.

public abstract abs_value();

Abstract Class

In java programming language, abstract classes are those that works only as the parent class or the base class. Subclasses are derived to implement the methods inherited from the abstract class (base class). Abstract classes are not instantiated directly. First extend the base class and then instantiate (create objects). Abstract classes are generic in nature and implement to those methods that are used commonly by the subclasses with common implementation. Abstract classes .

e.g.

abstract class A{
 public abstract abs_value();
 
 void show(){
 System.out.println("This is an abstract class");
 }
 }

Tutorials

  1. Abstract class,Abstract methods and classes
  2. Introduction
  3. Applications and Applets
  4. Jumping
  5. Class
  6. Classes in Java
  7. Exception Handling
  8. Iteration
  9. Javah
  10. Hello world
  11. Controlling your program
  12. An Overview of Java      Java is a programming language      Java is Object Oriented Programming
  13. Inheritance,Inheritance in Java,Java Inheritance
  14. input output
  15. Installing Java
  16. Marker Interface,Java Marker Interface
  17. Introduction to java arrays
  18. Java as a general purpose language
  19. The Java Applet Viewer
  20. Java Comments
  21. Java Compiler,Java Compiler Example
  22. Java Data Types
  23. Java Debugger,Java Debuggers
  24. Java Enabled browsers
  25. Java Features
  26. We can run Java on most platforms provided a platform must has a Java interpreter
  27. Java Keywords
  28. Java Literals
  29. Introduction
  30. Java package,Java Packages
  31. Javadoc
  32. Operators
  33. Operators
  34. Java Features
  35. The Switch statement
  36. Parallel Processing
  37. Master java in a week
  38. Variables in Java
  39. The while and do