Question

Need help debugging. first class seems fine. second class is shooting an error on s = super.getString(prompt);   third class is giving me an error in the while loop where int num = console.getInt("Enter an integer:");

//--------------------------------------------------------------------------

import java.util.Scanner;

public class Console
{
    private Scanner sc;
    boolean isValid;
    int i;
    double d;
  
    public Console()
    {
        sc = new Scanner(System.in);
    }
    public String getString(String prompt)
    {
        System.out.print(prompt);
        return sc.nextLine();
    }
    public int getInt(String prompt)
    {
        while (!isValid)
        {
            System.out.print(prompt);
            if (sc.hasNextInt())
            {
                i = sc.nextInt();
                isValid = true;
            }
            else
            {
                System.out.println("Error! Invalid integer. Try again.");
            }
            sc.nextLine();
        }
        return i;
    }
    public double getDouble(String prompt)
    {
        while (!isValid)
        {
            System.out.print(prompt);
            if (sc.hasNextDouble())
            {
                d = sc.nextDouble();
                isValid = true;
            }
            else
            {
                System.out.println("Error! Invalid number. Try again.");
            }
            sc.nextLine();
          
        }
        return d;
    }
}

//--------------------------------------------------------------------------

public class MyConsole
{
    boolean isValid;
    String s;
    public MyConsole()
    {
        super();
    }
    public String getString(String prompt)
    {
        while (isValid == false)
        {
            s = super.getString(prompt);
            if (s.equals(""))
            {
                System.out.println("Error! This entry is required. Try again.");
            }
            else
            {
                isValid = true;
            }
        }
        return s;
    }
}

public class MyConsole
{
    boolean isValid;
    String s;
    public MyConsole()
    {
        super();
    }
    public String getString(String prompt)
    {
        while (isValid == false)
        {
            s = super.getString(prompt);
            if (s.equals(""))
            {
                System.out.println("Error! This entry is required. Try again.");
            }
            else
            {
                isValid = true;
            }
        }
        return s;
    }
}

//--------------------------------------------------------------------

public class OddEvenApp
{
    public static void main(String[] args)
    {
        System.out.println("Welcome to the Odd/Even Checker!\n");
        MyConsole console = new MyConsole();
        String choice = "y";
        String oddOrEven;
        while (choice.equalsIgnoreCase("y"))
        {
            int num = console.getInt("Enter an integer: ");
            oddOrEven = "odd";

            if (num % 2 == 0)
            {
                oddOrEven = "even";
                System.out.println("The number " + num + " is " + oddOrEven + ".\n");
                choice = console.getString("Continue? (y/n): ");
                System.out.println();
            }
        }
    }
}

Answer 1

import java.util.Scanner;

public class Console

{

private Scanner sc;

boolean isValid;

int i;

double d;

  

public Console()

{

sc = new Scanner(System.in);

}

public String getString(String prompt)

{

System.out.print(prompt);

return sc.nextLine();

}

public int getInt(String prompt)

{

while (!isValid)

{

System.out.print(prompt);

if (sc.hasNextInt())

{

i = sc.nextInt();

isValid = true;

}

else

{

System.out.println("Error! Invalid integer. Try again.");

}

sc.nextLine();

}

isValid = false;

return i;

}

public double getDouble(String prompt)

{

while (!isValid)

{

System.out.print(prompt);

if (sc.hasNextDouble())

{

d = sc.nextDouble();

isValid = true;

}

else

{

System.out.println("Error! Invalid number. Try again.");

}

sc.nextLine();

  

}

return d;

}

}

//--------------------------------------------------------------------------

public class MyConsole extends Console

{

boolean isValid;

String s;

public MyConsole()

{

super();

}

public String getString(String prompt)

{

while (isValid == false)

{

s = super.getString(prompt);

if (s.equals(""))

{

System.out.println("Error! This entry is required. Try again.");

}

else

{

isValid = true;

}

}

isValid = false;

return s;

}

}

//--------------------------------------------------------------------

public class OddEvenApp

{

public static void main(String[] args)

{

System.out.println("Welcome to the Odd/Even Checker!\n");

MyConsole console = new MyConsole();

String choice = "y";

String oddOrEven;

while (choice.equalsIgnoreCase("y")) {

int num = console.getInt("Enter an integer: ");

oddOrEven = "odd";

if (num % 2 == 0)

{

oddOrEven = "even";

}

System.out.println("The number " + num + " is " + oddOrEven + ".\n");

choice = console.getString("Continue? (y/n): ");

System.out.println();

}

}

}

OUTPUT