Class_Objects.java

public class Class_Objects {
    public static void main(String[] args) {
        Box box1 = new Box(4.6, 7.9, 9.9);
        // box1.getL();
        Box box2 = new Box(box1); // copying the constructor
       System.out.println(box1.w + " " + box1.h);

       BoxWeight box3 = new BoxWeight(2.2, 3.1, 4.3, 10.5);
       BoxWeight box4 = new BoxWeight(box3);
       System.out.println(box3.h + " " + box3.weight);


       Box box5 = new BoxWeight(2, 3, 4, 8);
       System.out.println(box5.l);

        // there are many variables in both parent and child classes
        // you are given access to variables that are in the ref type i.e. BoxWeight
        // hence, you should have access to weight variable
        // this also means, that the ones you are trying to access should be initialised
        // but here, when the obj itself is of type parent class, how will you call the constructor of child class
        // this is why error
    //    Box box6 = new BoxWeight(2);
    //    System.out.println(box6);

//        Box.greeting();

        // BoxWeight box = new BoxWeight();
        // System.out.println(box);
        // BoxWeight.greeting(); // you can inherit but you cannot override
        Box box8 = new Box(34); // 3,4,2 -> Functions Parameters
        System.out.println(box8.h);
        BoxWeight BOX = new BoxWeight(3);
        // System.out.println(BOX.w);
        System.out.println(BOX.weight);
    }
}