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import java.lang.*;
abstract class Demo
{
public int i,j;
public Demo()
{
System.out.println("Demo constructor");
}
public void fun() //concrete
{
System.out.println("Demo fun");
}
public abstract void gun(); //abstract virtual void gun()=0;
}
class Hello extends Demo
{
public int x,y;
public Hello()
{
System.out.println("hello constructor");
}
public void sun() //concrete
{
System.out.println("hello sun");
}
public void gun() //concrete
{
System.out.println("hello gun");
}
}
class AbstractDemo1
{
public static void main(String a[])
{
Demo dobj; //we can create reference of abstract class
// dobj=new Demo(); we cant create object of abstract class
Hello hobj=new Hello();
hobj.fun();
hobj.gun();
hobj.sun();
}
}