Abstract Class in Java

Abstract Class in Java

In Previous Post, I'll give you the project code for Puzzle Game or Google Mail Sender using core Java, B'coz the reason is I want to show you the magics of Java , but today's we are going to some fundamentals, because this is very important to understand How java is work, where to use abstract, where to use interface etc.... 

Abstract : Abstract class is a class that can not be instantiated , it's object cannot be created , it's contain or some methods are abstract or undefined.

In the Next Example I'll show you only the simple example code, do some googling for definitions to understand abstract, interface, inheritance etc...

Before we are going to make the Simple Abstract Program, Just click on all the advertisement , available on this blog.

Example Code :   

                                  "Abstest.java"

public class Abstest extends Abstractclass{
public static void main(String arg[])
{

Abstractclass ob=new Abstest();
ob.sum();
}

}     

                             "Abstractclass.java"

public abstract class Abstractclass{

public void sum()
{
System.out.println(30);
}


public static void main(String arg[])
{

//Abstractclass ob=new Abstractclass();

}



}

                           "AbstractPen.java"

public abstract class AbstractPen{

public abstract void penprice();
public abstract void penbrand();
public void pencolor()
{
System.out.println("red");
}


}

                              "Abstractsubclass1.java"

abstract public class Abstractsubclass1 extends AbstractPen{

public void penprice()
{
System.out.println(200);
}

}

                             "Abstractsubclass2.java"

public class Abstractsubclass2 extends Abstractsubclass1
{
public void penbrand()
{
System.out.println("Renoylod");
}

public static void main(String arg[])
{

AbstractPen ref=new Abstractsubclass2();
ref.penprice();
ref.penbrand();
ref.pencolor();
}

}


Compile And Run these files...

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