Java

The idea is to implement a class to manage very basic rectangle objects in the Cartesian plane. For each rectangle, you must keep the coordinates of the lower-left corner, the width, and the height. The width and the height must be greater than or equal to 0.0.

The class must be called Rectangle. A basic skeleton of the class is given as a starting point. Your class must be complete enough for a professional use. For example, your class must provide:

a constructor with 2 parameters, the width and the height. In this case, the lower-left corner of the rectangle will be the origin of the Cartesian plane

a constructor with 4 parameters, representing the coordinates of two opposite corners of the rectangle (x1, y1, x2, and y2).

accessor and mutator methods

methods such as area, perimeter, diagonalLength, deltaMove, scale, toString, etc.

Two static methods (getDecPlaces and setDecPlaces) as a way to control the number of decimal places used in method toString to represent real numbers. By default, the number of decimal places will be 2.

Method diagonalLength returns the length of the diagonals of the rectangle. Method deltaMove has two parameters (deltaX and deltaY) and moves the rectangle, deltaX units horizontally and deltaY units vertically. Method scale has one parameter (scaleFactor) and proportionally changes the width and height of the rectangle. If scaleFactor is 1.0, then the size of the rectangle will not be affected by a call to method scale. If scaleFactor is 1.5, then the width and the height of the rectangle will be increased in 50%. The toString method returns a string representing the rectangle. According to the number of decimal places selected, the real numbers are represented with more or less precision. For example, for a rectangle of width 1.4, height 7.5, and with a lower-left corner in the origin, the toString method returns "Rectangle(0.0000, 0.0000, 1.4000, 7.5000)" if the number of decimal places is 4, and "Rectangle(0.00, 0.00, 1.40, 7.50)" if the number of decimal places is 2.

To test your Rectangle class, a user will be allowed to enter the following commands from the keyboard:

createWithTwoPoints : Define a rectangle variable called by specifying two opposite points (, ) and (, )

createWithLowerLeft : Define a rectangle variable called by specifying the lower-left corner (, ), the , and the .

show : Display the rectangle stored in variable with the specified number of decimal places. For example, if the rectangle has a width of 2.2, a height of 3.5, and a lower-left corner in the origin of the Cartesian plane, the command must display Rectangle(0.000, 0.000, 2.200, 3.500) when the number of decimal places is 3

showWidth : Display the width of the rectangle stored in variable . The number of decimal places shown is set by command decimal

showHeight : Display the height of the rectangle stored in variable . The number of decimal places shown is set by command decimal

showArea : Display the area of the rectangle stored in variable . The number of decimal places shown is set by command decimal

showPerimeter : Display the perimeter of the rectangle stored in variable . The number of decimal places shown is set by command decimal

showDiagonalLength : Display the length of the diagonals of the rectangle stored in variable . The number of decimal places shown is set by command decimal

showLowerLeftCorner : Display the lower-left corner of the rectangle stored in variable . The number of decimal places shown is set by command decimal

deltaMove : Move the rectangle , units horizontally and units vertically

scale : Proportionally change the width and height of the rectangle stored in . The factor to apply is given by

decimal : Set the number of decimal places when displaying information of a rectangle. The default value is 2.

Write a second class called TestRectangle that will read the commands from the keyboard and display the result on the standard output.

Input Format

The input will consist of several lines. In each line, there is a valid command. The commands have to be processed until reaching the end-of-file.

Constraints

Unfortunately, Hackerrank does not allow us to create 2 files. In the ideal solution, we should have a file called Rectangle.java for the class that manages the rectangle objects, and another file called TestRectangle.java for the test class. Here, we will just have one file with both classes.

Output Format

The output of the show* commands. For the exact format, see the test case.

Sample Input 0

createWithTwoPoints r1 5.5 2.4 3.3 4.1 show r1 showWidth r1 showHeight r1 showArea r1 showPerimeter r1 showDiagonalLength r1 showLowerLeftCorner r1 decimal 4 createWithLowerLeft r2 -2.5 -1.3 5.78 2.54 show r2 showArea r2 showDiagonalLength r2 scale r2 0.8 show r2 deltaMove r2 0.9 -0.5 show r2 

Sample Output 0

r1 = Rectangle(3.30, 2.40, 2.20, 1.70) width(r1) = 2.20 height(r1) = 1.70 area(r1) = 3.74 perimeter(r1) = 7.80 diagonalLength(r1) = 2.78 lowerLeftCorner(r1) = (3.30, 2.40) r2 = Rectangle(-2.5000, -1.3000, 5.7800, 2.5400) area(r2) = 14.6812 diagonalLength(r2) = 6.3135 r2 = Rectangle(-2.5000, -1.3000, 4.6240, 2.0320) r2 = Rectangle(-1.6000, -1.8000, 4.6240, 2.0320) 

Sample Input 1

createWithTwoPoints r1 -1.245 -2.562 6.865 7.1155 createWithTwoPoints r2 -5.5 2.4 3.3 4.1 createWithTwoPoints r3 -2.56 -7.44 -0.53 -5.12 show r1 show r2 show r3 decimal 4 scale r1 1.2 deltaMove r2 0.9 -0.5 scale r3 1.25 show r1 show r2 show r3 

Sample Output 1

r1 = Rectangle(-1.25, -2.56, 8.11, 9.68) r2 = Rectangle(-5.50, 2.40, 8.80, 1.70) r3 = Rectangle(-2.56, -7.44, 2.03, 2.32) r1 = Rectangle(-1.2450, -2.5620, 9.7320, 11.6130) r2 = Rectangle(-4.6000, 1.9000, 8.8000, 1.7000) r3 = Rectangle(-2.5600, -7.4400, 2.5375, 2.9000) 

CODE: class Rectangle { /* Enter your code here for the Rectangle class. */ private double lowerLeftX, lowerLeftY; private double width, height; private static int decPlaces = 2; public static int getDecPlaces() { /* To be completed */ } public static void setDecPlaces(int decPlaces) { /* To be completed */ } } }

class TestRectangle { /* Enter your code here for the TestRectangle class. */ public static void main(String[] args) { /* To be completed */ } }