abstract class abs{
public void display(){
}
public abstract void display1();

}
public class win extends abs{

public void hai(){
}

public void display1(){
}

}
class win2 extends abs{
public void display1(){
}

public void display(){
}
}





hai could u understand this program.....abstract class is nothing but a template 4 the subclasses .thats all clear....u have to keep 3 things in ur mind

1.abstract class can have abstract and non-abstract methods
2.if it have abstract method it should be implemented in its subclasses
3.abstract methods are overrided in which that is implemented . thats all abt abstract classes ...