Question

Need some assistance with a java program “Square,” that will implement a data type Square that represents squares with the x and y coordinates of their upper-left corners and the length.

The API should be as follows.

Square(double x, double y, double length) //constructor

double area() //returns the area of the square

double perimeter() //returns the perimeter of the square

boolean intersects(Square b) //does this square intersect b? Two squares would intersect if they share one or more common points

boolean contains(Square b) //does this square contain b?

void draw() //draw this square on standard drawing

Note: The program should include a main method to test that it does the following.

• Instantiate a Square object whose upper-left corner coordinates and length are given as command-line arguments. It should print out the area and perimeter of the square.

• Prompt the user for a second square’s upper-left corner coordinates and length, and indicate whether it intersects with the square specified earlier and also whether it contains the square specified earlier.

• Provide a pop-up window that displays the two squares.

A sample run would be as follows.

>java Square 0.2 0.7 0.3

The area is 0.09

The perimeter is 1.2

Enter the upper-left coordinates and the length of a square: 0.3 0.6 0.4

Answer 1

import java.util.Scanner;

public class Square {

        private double x;
        private double y;
        private double length;

        public Square(double x, double y, double length) {
                this.x = x;
                this.y = y;
                this.length = length;
        }

        public double area() {
                return length * length;
        }

        public double perimeter() {
                return 4 * length;
        }

        public boolean intersects(Square other) {

                // Two Square do not overlap, if one rectangle is on left of other, or on
                // top of other.

                // If one Square is on left side of other
                if ((this.x >= (other.x + other.length)) || (other.x >= (this.x + this.length))) {
                        return false;
                }

                // If one Square is above other
                if ((this.y >= (other.y + other.length)) || (other.y >= (this.length + this.y))) {
                        return false;
                }

                return true;
        }
        
        public boolean contains(Square b) {
                return (this.x <= b.x) && (this.x + length < b.x + b.length) 
                                && (this.y <= b.y) && (this.y + length < b.y + b.length);
        }
        
        public void draw() {
                System.out.println("The area is " + area());
                System.out.println("The perimeter is " + perimeter());
        }

        public static void main(String[] args) {
                Scanner in = new Scanner(System.in);

                Double x = Double.parseDouble(args[0]);
                Double y = Double.parseDouble(args[1]);
                Double l = Double.parseDouble(args[2]);
                
                Square s = new Square(x, y, l);
                s.draw();
                
                System.out.println("Enter the upper-left coordinates and the length of a square: ");

                x = Double.parseDouble(in.nextLine());
                y = Double.parseDouble(in.nextLine());
                l = Double.parseDouble(in.nextLine());

                Square r = new Square(x, y, l);
                r.draw();

                if(s.intersects(r)) {
                        System.out.println("Squares intersect.");
                } else {
                        System.out.println("Squares do not intersect.");
                }

                if(s.contains(r)) {
                        System.out.println("the new Squares is inside old square.");
                } else {
                        System.out.println("the new Squares is not contained in old square.");
                }
                
                in.close();
        }

}

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