Answer to Question #273963 in Java | JSP | JSF for harryy

Question

To be able to do this, you should create a class for a point (that has an x-coordinate and a y-coordinate). Also, create another class called Rectangle. The Rectangle should have 2 points, the top left and the bottom right. Implement the following methods for the Rectangle:

• display() - draws the rectangle on the console based on the sample
• area() - computes and returns the area of a given rectangle
• perimeter() - computes and returns the perimeter of a given rectangle
• centerPoint() - computes and returns the center point of a given rectangle
• isSquare() - checks whether a given rectangle is a square or not. 

Input

A pair of numbers representing the points for the rectangle (x and y).

5 8

Output

The first few lines contain the drawn rectangle. After one empty line, the next line prints either "RECTANGLE" or "SQUARE".

#·#·#·#·#·#
#·········#
#·········#
#·········#
#·········#
#·········#
#·········#
#·········#
#·#·#·#·#·#

RECTANGLE
AREA:·40
PERIMETER:·26
CENTER·POINT:·(2.50,4.00)

Answer 1

public class Point {
    private double x;
    private double y;

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

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }

    @Override
    public String toString() {
        return "(" + x + ", " + y + ")";
    }
}

public class Rectangle {
    private Point topLeft;
    private Point bottomRight;

    public Rectangle(Point topLeft, Point bottomRight) {
        this.topLeft = topLeft;
        this.bottomRight = bottomRight;
    }

    public void display() {
        int width = (int) (bottomRight.getX() - topLeft.getX());
        int height = (int) (topLeft.getY() - bottomRight.getY());
        for (int i = 0; i < height; i++) {
            for (int j = 0; j < width; j++) {
                if (j == 0 || j == width - 1 || i == 0 || i == height - 1) {
                    System.out.print("#");
                } else {
                    System.out.print(".");
                }
            }
            System.out.println();
        }
        System.out.println(isSquare() ? "\nSQUARE" : "\nRECTANGLE");
        System.out.println("AREA: " + area());
        System.out.println("PERIMETER: " + perimeter());
        System.out.println("CENTER POINT: " + centerPoint());
    }

    public double area() {
        return (bottomRight.getX() - topLeft.getX()) * (topLeft.getY() - bottomRight.getY());
    }

    public double perimeter() {
        return 2 * ((bottomRight.getX() - topLeft.getX()) + (topLeft.getY() - bottomRight.getY()));
    }

    public Point centerPoint() {
        return new Point((bottomRight.getX() - topLeft.getX()) / 2, (topLeft.getY() - bottomRight.getY()) / 2);
    }

    public boolean isSquare() {
        return (bottomRight.getX() - topLeft.getX()) == (topLeft.getY() - bottomRight.getY());
    }
}