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Class

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This section explores the concept of a class in reference to object oriented programming techniques. A class defines the properties of objects and methods used to control an object's behavior.

Class

     

This section explores the concept of a class in reference to object oriented programming techniques. A class defines the properties of  objects and methods used to control an object's behavior. In terms of object-oriented programming, the class is like a template from which an instance (object) of a class is created at run time.

Let us consider an example of a car. Manufacturer made so many cars, all cars have their own unique state but they have same behavior (you can learn about state and behavior in the topic object.). To built a car, a blueprint is required that specifies a perfect design and illustrates the vital things to manufacture a car. This blueprint or the model can now be used to manufacture thousands and  thousands of cars ready to run on the roads.

The same concept is employed in the object oriented techniques to create the objects through programming. The blueprints used to create the objects are called classes. A class defines the properties of the objects and the methods used to control an object's behavior. In terms of object-oriented programming, a class is like a template from which an instance of that class is created at run time.

After defining a class, it can be used to create objects by instantiating the class. Each object occupies some memory to hold its instance variables (i.e. its state).  The state of each object is separate from that of the others.  After an object is created, it can be used to get the desired functionality together with its class.

Now we will learn, how to define a class having methods, objects and declaration of method by a given example.

In the given example we
create a main class "Classtest" and also create a class "Example" which is outside of the main class and define a method "display" in it. Now create a class object "myExample" of class "Example" and call display() method in main class. The class "Example" is the blue print of the class "Classtest".

Here is the Code of the Example :

Classtest.java

import java.lang.*;

public class Classtest{
  public static void mainString args[] )
  {
  Example myExample = new Example();
  myExample.display();
  }
  }
  class Example
  {
  public void display(){
  System.out.println"\nIt's a example of class" );
  }
  }

Here is the Output of the Example :

C:\roseindia>javac Classtest.java

C:\roseindia>java Classtest

It's a example of class

Download This Example :

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Posted on: March 13, 2008

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