Question

Create a program to input the length and width of a rectangle and calculate and print the perimeter and area of the rectangle. To do this you will need to write a Rectangle class and a separate runner class. Your program should include instance variables, constructors, an area method, a perimeter method, a toString method, accessor and mutator methods, and user input. Your runner class should include 3 Rectangle objects. One default rectangle, one coded rectangle, and one user input rectangle. All methods should be tested in the runner class.

Answer 1

//Rectangle.java
public class Rectangle {
    int length, width;

    public Rectangle() {
        length = 0;
        width = 0;
    }

    public Rectangle(int length, int width) {
        this.length = length;
        this.width = width;
    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public String toString() {
        return "Rectangle{" +
                "length=" + length +
                ", width=" + width +
                '}';
    }

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

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

///////////////////////////////////////////////////////////

//RectangleRunner.java
import java.util.Scanner;
public class RectangleRunner {
    public static void main(String[] args) {
        Rectangle rectangle1 = new Rectangle();
        System.out.println("Area of rectangle 1 = "+rectangle1.area());
        System.out.println("Perimeter of rectangle 1 = "+rectangle1.perimeter());
        System.out.println();

        Rectangle rectangle2 = new Rectangle(2,3);
        System.out.println("Area of rectangle 2 = "+rectangle2.area());
        System.out.println("Perimeter of rectangle 2 = "+rectangle2.perimeter());
        System.out.println();

        Scanner scanner = new Scanner(System.in);
        int length, width;
        System.out.print("Enter length: ");
        length = scanner.nextInt();
        System.out.print("Enter width: ");
        width = scanner.nextInt();
        Rectangle rectangle3 = new Rectangle(length, width);
        System.out.println("Area of rectangle 3 = "+rectangle3.area());
        System.out.println("Perimeter of rectangle 3 = "+rectangle3.perimeter());
        System.out.println();
    }
}