SalesTaxProject/Validator.java at master · chandlerkeyes/SalesTaxProject · GitHub

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/**
 * Created by chand on 7/27/2017.
 */
import java.util.Scanner;
public class Validator {
    public static String getString(Scanner sc, String prompt) {
        System.out.print(prompt);
        String s = sc.next();  // read user entry
        sc.nextLine();  // discard any other data entered on the line
        return s;
    }

    public static int getInt(Scanner sc, String prompt) {
        int i = 0;
        boolean isValid = false;
        while (isValid == false) {
            System.out.println(prompt);
            if (sc.hasNextInt()) {
                i = sc.nextInt();
                isValid = true;
            } else {
                System.out.println("Error! Invalid integer value. Try again.");
            }
            sc.nextLine();  // discard any other data entered on the line
        }
        return i;
    }

    public static int getInt(Scanner sc, String prompt,
                             int min, int max) {
        int i = 0;
        boolean isValid = false;
        while (isValid == false) {
            i = getInt(sc, prompt);
            if (i < min)
                System.out.println(
                        "Error! Number must be " + min + " or greater.");
            else if (i > max)
                System.out.println(
                        "Error! Number must be " + max + " or less.");
            else
                isValid = true;
        }
        return i;
    }

    public static double getDouble(Scanner sc, String prompt) {
        double d = 0;
        boolean isValid = false;
        while (isValid == false) {
            System.out.print(prompt);
            if (sc.hasNextDouble()) {
                d = sc.nextDouble();
                isValid = true;
            } else {
                System.out.println("Error! Invalid decimal value. Try again.");
            }
            sc.nextLine();  // discard any other data entered on the line
        }
        return d;
    }

    public static double getDouble(Scanner sc, String prompt,
                                   double min, double max) {
        double d = 0;
        boolean isValid = false;
        while (isValid == false) {
            d = getDouble(sc, prompt);
            if (d < min)
                System.out.println(
                        "Error! Number must be " + min + " or greater.");
            else if (d > max)
                System.out.println(
                        "Error! Number must be " + max + " or less.");
            else
                isValid = true;
        }
        return d;
    }
    public static String yOrNValid(String yOrN) {
        Scanner keyboard = new Scanner(System.in);
        while (!yOrN.equalsIgnoreCase("y") && !yOrN.equalsIgnoreCase("n")) {
            System.out.println("Invalid Input. Please enter Y or N: ");
            yOrN = keyboard.nextLine();
        }
        return yOrN;
    }

}