JavaCodes/Virtual.java at main · raskarabhi45/JavaCodes · GitHub

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import java.lang.*;

class Base
{
    public int i,j;
    public void fun()
    { System.out.println("Base fun"); }

    public void gun()
    {  System.out.println("Base gun"); }

    public void sun()
    { System.out.println("Base sun"); }


}

class Derived extends Base
{
    public int x,y;

    public void fun()
    { System.out.println("Derived fun"); }

    public void sun()
    { System.out.println("Derived sun"); }

    public void run()
    { System.out.println("Derived run"); }
}

class Virtual
{
    public static void main(String arg[])
    {
        //Base bobj=new Base();  //no casting
        //Derived dobj=new Derived(); //no casting

        Base obj=new Derived(); //upcasting
        //Derived obj2=new Base(); //downcasting

        obj.fun();
        obj.gun();
        obj.sun();
        //obj.run();
    }
}