Super Keyword using Java in NetBeans

class a{
    int maxSpeed = 120;
}
class b extends a{
    int maxSpeed = 180;
    void display(){
        System.out.println("Maximum Speed: " + super.maxSpeed);
    }
}
public class p31_superkeyword {
    public static void main(String[] args){
        b object=new b();
        object.display();
    }   
}