Test.java

class Box {
    double width, height, depth;

    Box(double w, double h, double d) {
        width = w;
        height = h;
        depth = d;
    }

    Box() {

        width = height = depth = 0;
    }

    Box(double len) {
        width = height = depth = len;
    }

    double volume() {
        return width * height * depth;
    }
}

public class Test {
    public static void main(String args[]) {
        Box mybox1 = new Box(10, 20, 15);
        Box mybox2 = new Box();
        Box mycube = new Box(7);
        double vol;
        vol = mybox1.volume();
        System.out.println(" Volume of mybox1 is " + vol);
        vol = mybox2.volume();
        System.out.println(" Volume of mybox2 is " + vol);
        vol = mycube.volume();
        System.out.println(" Volume of mycube is " + vol);
    }
}