Answer the following questions based on the following Rectangle class: public cl
ID: 3604337 • Letter: A
Question
Answer the following questions based on the following Rectangle class:
public class Rectangle
{
private int length;
private int width;
public Rectangle(int length, int width)
{
this.length = length;
this.width = width;
}
public int area()
{
return length * width;
}
)
a) Write a class Cube:
-It should inherit from Rectangle
-It should have one instance variable for height
-It should have one constructor that takes 3 parameters (length, width, and height)
-You should NOT include any other methods or instance variables
b) Write the toString method for Rectangle – if length is 3 and width is 2, it should return “3 x 2”
c) Write a volume method for Cube that uses the area method in the Rectangle class
d) Explain why I made the instance variables (length and width) in Rectangle private instead of public
Explanation / Answer
Myclass.java
//reactangle class defination
class Rectangle
{
private int length;
private int width;
Rectangle(int length, int width)
{
this.length = length;
this.width = width;
}
public String toString()
{
return length+" * "+ width;
}
public int area()
{
return length * width;
}
}
//cube class defination
class Cube extends Rectangle
{
//instance varible declaration
private int height;
//Cube class construtor with three parameters
Cube(int l,int w,int h)
{
super(l,w);
this.height=h;
}
//cube method defination
public int Volume()
{
return area() * height;
}
}
//Main function defination
public class MyClass {
public static void main(String args[]) {
//Object creation for Cube class
Cube c =new Cube(10,20,30);
//display cube volume
System.out.println("Volume of Cube is " + c.Volume());
//display rectangle area
System.out.println("Area of Rectangle : "+c.toString() +" " + c.area());
}
}
Output :
Volume of Cube is 6000
Area of Rectangle : 10 * 20 200
d) The private access modifier is accessible only within class.
Access Modifier within class within package outside package by subclass only outside package
Private Yes No No No
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.