Answered: ValidatorString.java X Validator.java X…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Related questions

Question

Complete the code and make it run sucessful by fixing errors

//MainValidatorA3

public class MainA3 {
public static void main(String[] args) {
System.out.println("Welcome to the Validation Tester application");

// Int Test
System.out.println("Int Test");
ValidatorNumeric intValidator = new ValidatorNumeric("Enter an integer between -100 and 100: ", -100, 100);
int num = intValidator.getIntWithinRange();
System.out.println("You entered: " + num + "\n");

// Double Test
System.out.println("Double Test");
ValidatorNumeric doubleValidator = new ValidatorNumeric("Enter a double value: ");
double dbl = doubleValidator.getDoubleWithinRange();
System.out.println("You entered: " + dbl + "\n");

// Required String Test
System.out.println("Required String Test:");
ValidatorString stringValidator = new ValidatorString("Enter a required string: ");
String requiredString = stringValidator.getRequiredString();
System.out.println("\nYou entered: " + requiredString + "\n");

// String Choice Test
System.out.println("String Choice Test");
ValidatorString choiceValidator = new ValidatorString("Select one (x/y): ", "x", "y");
String choice = choiceValidator.getChoiceString();
System.out.println("You entered: " + choice);

System.out.println("\nAll Done!");
}
}

//ValidatorNumeric

import java.util.Scanner;

class ValidatorNumeric {
private String prompt;
private int minInt, maxInt;
private double minDouble, maxDouble;

public ValidatorNumeric() {}

public ValidatorNumeric(String prompt, int min, int max) {
this.prompt = prompt;
this.minInt = min;
this.maxInt = max;
}

public ValidatorNumeric(String prompt, double min, double max) {
this.prompt = prompt;
this.minDouble = min;
this.maxDouble = max;
}

public int getInt() {
Scanner scanner = new Scanner(System.in);
System.out.print(prompt);
while (!scanner.hasNextInt()) {
System.out.println("Error! Invalid integer value. Try again.");
System.out.print(prompt);
scanner.next();
}
return scanner.nextInt();
}

public int getIntWithinRange() {
int num;
do {
num = getInt();
if (num < minInt) {
System.out.println("Error! Number must be greater than " + (minInt - 1));
} else if (num > maxInt) {
System.out.println("Error! Number must be less than " + (maxInt + 1));
}
} while (num < minInt || num > maxInt);
return num;
}

public double getDouble() {
Scanner scanner = new Scanner(System.in);
System.out.print(prompt);
while (!scanner.hasNextDouble()) {
System.out.println("Error! Invalid decimal value. Try again.");
System.out.print(prompt);
scanner.next();
}
return scanner.nextDouble();
}

public double getDoubleWithinRange() {
double num;
do {
num = getDouble();
if (num < minDouble) {
System.out.println("Error! Number must be greater than " + minDouble);
} else if (num > maxDouble) {
System.out.println("Error! Number must be less than " + maxDouble);
}
} while (num < minDouble || num > maxDouble);
return num;
}
}

Validator.Java

// Validator.java

import java.util.Scanner;

public interface Validator {
String getRequiredString();
String getChoiceString();
}