Question

using java Create a class Rectangle with attributes length and width both are of type double. In your class you should provide the following:

• Provide a constructor that defaults length and width to 1.
• Provide member functions that calculate the area, perimeter and diagonal of the rectangle.
• Provide set and get functions for the length and width attributes. The set functions should verify that the length and width are larger than 0.0 and less that 50.0.
• Provide a member function that prints length, width, area, perimeter and diagonal.
• Test your code using at least two objects.

Answer 1

class Rectangle{

    private double length;
    private double width;

    //Constructor
    public Rectangle() {
        this.length = this.width = 1;
    }

    public double getLength() {
        return length;
    }

    public void setLength(double length) {
        if(length > 0.0 && length < 50.0)
            this.length = length;
        else
            System.out.println("Invalid length");
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        if(width > 0.0 && width < 50.0)
            this.width = width;
        else
            System.out.println("Invalid width");
    }

    public double getArea(){
        return length * width;
    }

    public double getPerimeter(){
        return 2 * (length + width);
    }

    public double getDiagonal(){
        return Math.sqrt(Math.pow(length, 2) + Math.pow(width, 2));
    }

    public void print(){
        System.out.println("Length: " + length);
        System.out.println("Width: " + width);
        System.out.println("Area: " + getArea());
        System.out.println("Perimeter: " + getPerimeter());
        System.out.println("Diagonal: " + getDiagonal());
    }

    //Main method to test Rectangle class
    public static void main(String[] args){
        Rectangle r1 = new Rectangle();
        Rectangle r2 = new Rectangle();
        System.out.println("Testing first object");
        r1.setLength(40);
        r1.setWidth(15);
        r1.print();
        System.out.println("\nTesting second object");
        r2.setLength(60);
        r2.setLength(20);
        r2.setWidth(5);
        r2.print();
    }
}

SAMPLE OUTPUT: