Answer to Question #275408 in Java | JSP | JSF for harlington

Question

Encapsulation

Create a class main and 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

import java.util.Scanner;


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 + ")";
	}
}


class Rectangle {
	private Point topLeft;
	private Point bottomRight;


	public Rectangle(Point topLeft) {
		this.topLeft = topLeft;
		this.bottomRight = new Point(0, 0);
	}


	public void display() {
		int width = (int) (bottomRight.getX() - topLeft.getX());
		width = Math.abs(width);
		int height = (int) (topLeft.getY() - bottomRight.getY());
		height = Math.abs(height);
		for (int i = 0; i <= height; i++) {
			for (int j = 0; j <= width; j++) {
				if (j == 0 || j == width || i == 0 || i == height) {
					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());
	}


	private double area() {
		return Math.abs((bottomRight.getX() - topLeft.getX())) * Math.abs((topLeft.getY() - bottomRight.getY()));
	}


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


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


	private boolean isSquare() {
		return Math.abs((bottomRight.getX() - topLeft.getX())) == Math.abs((topLeft.getY() - bottomRight.getY()));
	}
}


public class App {


	/**
	 * The start point of the program
	 * 
	 * @param args
	 * 
	 */
	public static void main(String[] args) {
		Scanner keyBoard = new Scanner(System.in);
		int x = keyBoard.nextInt();
		int y = keyBoard.nextInt();
		Rectangle rectangle = new Rectangle(new Point(x, y));
		rectangle.display();
		keyBoard.close();
	}
}