You can use the validation methods in this file from other code files in this project:

String name = Validation.getString(in, Enter your name, 20); int age = Validation.getInteger(in, Enter your age, 0, 80);

But there are several errors in the Validation.java file. Find them and fix them.

(This "validation" method is going to be called to ultimately write a histogram, but there are several errors that need to be fixed before it works properly. The desired histogram output is included at the end.)

/** * */ import java.util.Scanner; /** * @author * */ public class Validation { public static String getString(Scanner in, String prompt, int maxLength) { boolean valid = true; String s = ""; System.out.print(prompt); System.out.print(" : "); do { s = in.nextLine(); if (s.length() > 0) // ignore blank lines { if (s.length() < maxLength) { valid = true; } else { System.out.printf("Minimum length is %d characters. Try again."); } } } while(!valid); return s; } public static int GetInteger(Scanner in, String prompt, int lower, int upper) { boolean valid = false, outOfRange = false; int input = -1; do { System.out.print(prompt); if (outOfRange) System.out.printf(" [between %d and %d inclusive]", lower, upper); System.out.print(": "); while (in.hasNextInt()) { in.nextDouble(); System.out.println("Please enter an integer."); } input = in.nextInt(); if (input >= 0 && input <= 100) { valid = true; } else { System.out.println("Value is out of range."); outOfRange = true; } } while (!valid); return input; } }

Catch non-integers (doubles), strings and values out of range

Histogram Generator by Student

Enter the histogram title : Favorite Languages of Students

Enter the number of items: 100

Value is out of range.

Enter the number of items [between 0 and 10 inclusive]: x

Please enter an integer.

4

Enter item 1 : Java

Enter value 1: 10

Enter item 2 : Supersized Java

Maximum length is 10 characters. Try again.

Super Java

Enter value 2: 5

Enter item 3 : C++

Enter value 3: 7

Enter item 4 : JavaScript

Enter value 4: 50.0

Please enter an integer.

50

Value is out of range.

Enter value 4 [between 0 and 25 inclusive]: 3

Favorite Languages of Students

Java @@@@@@@@@@

Super Java @@@@@

C++ @@@@@@@

JavaScript @@@