Inheritance Usage

class superclass{

    Integer x;

public void setx(int x){

    this.x=x;

}

public Integer getx(){

    return x;

}

 

}

 

class subclass extends superclass{

    Integer y;

public void sety(int y){

    this.y=y;

}

 

public Integer gety(){

    return y;

}

}

 

public class First {

public static void main(String args[]){

    superclass a;

    subclass b=new subclass();

    b.setx(10);

    b.sety(20);

    a=b; // sub class to super class , only members of superclass in subclass will to super class

System.out.println(b.getx()+" "+a.getx());

    a.setx(100);

    

    //b=a;

    

    /

      

    

}

}