Question

Override the methods below (in SBox). The overridden methods should perform the actions mentioned below and it and must display the following message “Overridden method X”, where X is the method name.

a. setlength(int x ), to set the length

b. setWidth (int y ) to set the width

c. setHeight (int z) to set the height & d. displayCalculatedVolume( ) that calculates the volume and displays it.

Answer 1

/*Box is the base class and Sbox is the derived class*/

//importing packages

import java.util.*;
import java.lang.*;
import java.io.*;

class Box{
public void setLength(int x){
System.out.println("Length is "+x);
}
public void setWidth(int y){
System.out.println("Width is "+y);
}
public void setHeight(int z){
System.out.println("Height is "+z);
}
}
class Sbox extends Box{
int l,h,w;
public void setLength(int x){
System.out.println("Overidding method setLength..");
l = x;
}
public void setWidth(int y){
System.out.println("Overidding method setWidth..");
h = y;
}
public void setHeight(int z){
System.out.println("Overidding method setHeight..");
w = z;
}
public void displayCalculatedVolume(int x, int y, int z){
int vol;
setLength(x);
setWidth(y);
setHeight(z);
vol = l*h*w;
System.out.println("Volume is " + vol);
}
public static void main(String args[]){
Sbox obj = new Sbox();
obj.displayCalculatedVolume(2,3,6);
}
}

Output screenshot:

Note

• This program is written in java.
• A method is overridden when a derived class has the same method as the base class with the same signature (the parameters passed to the methods, in this case int x, int y, int z).
• Here in the derived class we create an object 'obj' which calls the method displayCalculatedVolume(int x, int y, int z). This method calls the three methods setLength(int x), setWidth(int y) and setHeight(int z) to set the value to the class variables l,h,w. And calculate the volume of the box as well as dispay it.