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POOOP advice - should I change how my program runs?
 

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  1. POOOP advice - should I change how my program runs?
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    <p>below I have a small program i wrote for working out the area of shapes....</p> <p>My question is this the right way to do it, a friend did similar and had multiple shapes which inherited from main shape. OOP? is mine ok as i will only ask the area of a shape and no more? and how would i change this to make it more OO?</p> <p>Main Prog /////</p> <pre><code>package areaprog; import java.util.Scanner; import java.util.InputMismatchException; public class Mainprog { public static void main (String [] args){ //Area Menu Selection System.out.println("What shape do you need to know the area of?\n" + "1: Square?\n" + "2: Rectangle?\n" + "3: Triangle?\n" + "4: Circle? \n" + "5: Exit\n" ); //User input for menu Scanner reader = new Scanner(System.in); System.out.println("Number: "); //Menu syntax checking while (!reader.hasNextDouble()) { System.out.println("Thats not a number you tool.\n"); System.out.println("Now pick again\n" + "1: Square?\n" + "2: Rectangle?\n" + "3: Triangle?\n" + "4: Circle? \n" + "5: Exit\n" ); reader.next(); //ask for next token } double input = reader.nextDouble(); reader.nextLine(); //Depending on user selection, depends on what method is called using switch. Scanner scan = new Scanner(System.in); //Square selection and InputMismatch Exception try { if (input == 1){ System.out.println("What is a length of 1 side of the Square?\n"); double s1 = scan.nextDouble(); double SqAns = AreaCalculator.getSquareArea(s1); System.out.println("The area of you square is: " + SqAns); } } catch (InputMismatchException e) { System.out.println("Why are you trying to be clever? use an interger"); } //Rectangle selection if (input == 2){ System.out.println("What is the width of your rectangle?.\n"); double r1 = scan.nextDouble(); System.out.println("What is the height of your rectangle?\n"); double r2 = scan.nextDouble(); double RecAns = AreaCalculator.getRectArea(r1, r2); System.out.println("The area of your rectangle is: " + RecAns); } //Triangle selection if (input == 3){ System.out.println("What is the base length of the triangle?."); double t1 = scan.nextDouble(); System.out.println("What is the height of your triangle?"); double t2 = scan.nextDouble(); double TriAns = AreaCalculator.getTriArea(t1, t2); System.out.println("The area of your triangle is " + TriAns); } //Circle selection if (input == 4){ System.out.println("What is the radius of your circle?."); double c1 = scan.nextDouble(); double CircAns = AreaCalculator.getCircleArea(c1); System.out.println("The area of your circle is " + CircAns); } //Exit application if (input == 5){ System.out.println("Goodbye."); } } } </code></pre> <p>AreaCalculator.java ////</p> <pre><code> package areaprog; public class AreaCalculator { public static double getRectArea(double width, double height) { double aValue = width * height; return aValue; } public static double getCircleArea(double radius){ double PI = Math.PI; double aValue = PI * Math.pow(radius, 2); return aValue; } public static double getSquareArea(double side) { double aValue = Math.pow(side, 2); return aValue; } public static double getTriArea(double base , double height) { double aValue = (base/2)* height; return aValue; } } </code></pre>
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    1. USAnderson Pimentel
    1. UStmcraig
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      1. POOOP advice - should I change how my program runs?
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    1. COYou'd be better off using an `enum` for your shapes.
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      1. POOOP advice - should I change how my program runs?
      1. USOldCurmudgeon
    2. CO@OldCurmudgeon Why an enum instead of a class?
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      1. POOOP advice - should I change how my program runs?
      1. USDave Newton
    3. COBecause it is a set of classes which all do similar things. E.G. They all need a `getArea` method.
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      1. POOOP advice - should I change how my program runs?
      1. USOldCurmudgeon
 

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