Question:

Consider the following class definition:

public class Rectangle {
    private int length;
    private int width;

    public Rectangle(int initialLength, int initialWidth) {
        length = initialLength;
        width = initialWidth;
    }

    public int getLength() {
        return length;
    }

    public int getWidth() {
        return width;
    }

    public void setLength(int newLength) {
        length = newLength;
    }

    public void setWidth(int newWidth) {
        width = newWidth;
    }

    public int calculateArea() {
        return length * width;
    }

    public int calculatePerimeter() {
        return 2 * (length + width);
    }
}

Create a program that demonstrates the use of the Rectangle class.

Your program should perform the following steps:

1. Create two Rectangle objects: rect1 with a length of 4 and a width of 6, and rect2 with a length of 7 and a width of 3.
2. Print the length and width of rect1 using the appropriate methods.
3. Print the length and width of rect2 using the appropriate methods.
4. Calculate and print the area of rect1 using the calculateArea method.
5. Calculate and print the area of rect2 using the calculateArea method.
6. Calculate and print the perimeter of rect1 using the calculatePerimeter method.
7. Calculate and print the perimeter of rect2 using the calculatePerimeter method.

Write the code for the program and provide the output.

Answer:

public class Main {
    public static void main(String[] args) {
        // Create two Rectangle objects
        Rectangle rect1 = new Rectangle(4, 6);
        Rectangle rect2 = new Rectangle(7, 3);
        
        // Print length and width of rect1
        System.out.println("Length of rect1: " + rect1.getLength());
        System.out.println("Width of rect1: " + rect1.getWidth());
        
        // Print length and width of rect2
        System.out.println("Length of rect2: " + rect2.getLength());
        System.out.println("Width of rect2: " + rect2.getWidth());
        
        // Calculate and print area of rect1
        int rect1Area = rect1.calculateArea();
        System.out.println("Area of rect1: " + rect1Area);
        
        // Calculate and print area of rect2
        int rect2Area = rect2.calculateArea();
        System.out.println("Area of rect2: " + rect2Area);
        
        // Calculate and print perimeter of rect1
        int rect1Perimeter = rect1.calculatePerimeter();
        System.out.println("Perimeter of rect1: " + rect1Perimeter);
        
        // Calculate and print perimeter of rect2
        int rect2Perimeter = rect2.calculatePerimeter();
        System.out.println("Perimeter of rect2: " + rect2Perimeter);
    }
}

Output:

Length of rect1: 4
Width of rect1: 6
Length of rect2: 7
Width of rect2: 3
Area of rect1: 24
Area of rect2: 21
Perimeter of rect1: 20
Perimeter of rect2: 20

Explanation:

1. We create two Rectangle objects by invoking the Rectangle constructor with the specified values for length and width.
2. To print the length and width of rect1, we use the getLength() and getWidth() methods of the Rectangle class on the rect1 object.
3. Similarly, we print the length and width of rect2 by invoking the respective methods.
4. To calculate the area of rect1, we call the calculateArea() method on the rect1 object and store the result in rect1Area variable.
5. For rect2, we calculate the area in the same way and store it in rect2Area variable.
6. To calculate the perimeter of rect1, we call the calculatePerimeter() method on rect1 and store the result in rect1Perimeter variable.
7. Similarly, we calculate and store the perimeter of rect2 in rect2Perimeter variable.
8. Finally, we print the values of all the variables to get the desired output.