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  #1  
Old February 21st, 2013, 09:42 PM
vertroa vertroa is offline
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Help save a newb
Edit: So I realized I am retarded and fixed the problem in the function here.

java Code:
Original - java Code 
  1.     public static boolean exit() {
  2.         boolean exitProgram = false;
  3.         Scanner input = new Scanner(System.in);
  4.         String close = "n";
  5.         System.out.println("Are you sure you want to exit? (y/n)");
  6.         close = input.nextLine();
  7.             if (close.equals("y")) {
  8.                 exitProgram = true;
  9.             } else {
  10.                 exitProgram = false;
  11.             }
  12.         // input.close();
  13.         return exitProgram;
  14.     }


However I had to comment out my close on the scanner because it gives an error on "n". So my next question is how would I close the scanner in this instance? Or better yet use the same scanner? Thanks!

java Code:
Original - java Code 
  1. import java.util.Scanner;
  2. import java.util.Arrays;
  3.  
  4. abstract class Shape {
  5.     private static double scaleFactor;
  6.     
  7.     abstract void getArea();
  8.     abstract void getPerimeter();
  9.     abstract void scaleShape();
  10. }
  11. //
  12. //class Circle extends Shape {
  13. //  
  14. //}
  15. // 
  16. //class Rectangle extends Shape {
  17. //  
  18. //}
  19.  
  20.  
  21. public class lab5 {
  22.     
  23.     public static boolean exit() {
  24.         boolean exitProgram = false;
  25.         Scanner input = new Scanner(System.in);
  26.         String close = "n";
  27.         System.out.println("Are you sure you want to exit? (y/n)");
  28.         close = input.nextLine();
  29.             if (close == "y") {
  30.                 exitProgram = true;
  31.             } else {
  32.                 exitProgram = false;
  33.             }
  34.         input.close();
  35.         return exitProgram;
  36.     }
  37.     
  38.     public static void main(String[] args) {
  39.         
  40.         boolean closeProgram = true;
  41.         int userOption= 0;
  42.             
  43.         // Create scanner
  44.         Scanner input = new Scanner(System.in);
  45.         
  46.         do {    
  47.             // User selects a menu option
  48.             System.out.println("Please select an option. \n" + 
  49.                     "1. Add a new circle \n" + 
  50.                     "2. Add a new rectangle \n" +
  51.                     "3. Delete all Shapes \n" +
  52.                     "4. Scale all shapes \n" +
  53.                     "5. Display the perimeters of all shapes \n" +
  54.                     "6. Display the areas of all shapes \n" +
  55.                     "7. Enter scale factor \n" +
  56.                     "8. Exit the program \n");
  57.             userOption = input.nextInt();
  58.         
  59.                 switch (userOption) {
  60.                     case 1: 
  61.                         
  62.                         break;
  63.                     case 2: 
  64.                         
  65.                         break;
  66.                     case 3: 
  67.                         
  68.                         break;
  69.                     case 4: 
  70.                         
  71.                         break;
  72.                     case 5: 
  73.                         
  74.                         break;
  75.                     case 6: 
  76.                         
  77.                         break;
  78.                     case 7: 
  79.                         
  80.                         break;
  81.                     case 8: 
  82.                         closeProgram = exit();
  83.                         break;
  84.                     }
  85.                 
  86.                 // Reset vars
  87.                 userOption = 0;
  88.                 
  89.         } while (closeProgram == false);
  90.         // Close scanner
  91.         input.close();
  92.     }
  93. }


I get this error at the end:

Code:
Exception in thread "main" java.util.InputMismatchException
	at java.util.Scanner.throwFor(Unknown Source)
	at java.util.Scanner.next(Unknown Source)
	at java.util.Scanner.nextInt(Unknown Source)
	at java.util.Scanner.nextInt(Unknown Source)
	at lab5.main(lab5.java:59)
Last edited by vertroa : February 21st, 2013 at 10:54 PM. Reason: Fixed it kinda
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  #2  
Old February 22nd, 2013, 05:51 AM
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NormR NormR is offline
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Quote:
InputMismatchException

At line 59 the Scanner class's nextInt() method tried to read a numeric input but got non-numeric data and threw the exception.

The user should be careful to enter the right data for the program
or the program should be careful when reading data to make sure the right data is available. The Scanner class's hasNext... methods could be used to test the type of the input.
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  #3  
Old February 22nd, 2013, 08:20 AM
vertroa vertroa is offline
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Quote:
Originally Posted by NormR
At line 59 the Scanner class's nextInt() method tried to read a numeric input but got non-numeric data and threw the exception.

The user should be careful to enter the right data for the program
or the program should be careful when reading data to make sure the right data is available. The Scanner class's hasNext... methods could be used to test the type of the input.


Okay, I am going to take a look at the hasNext thing. I have been only inputting ints so I don't know how it is reading non ints.
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