package numberwords2;
import java.awt.Component;
import javax.swing.JOptionPane;
public class NumberWords2
{
    static String rawInput;
    static String output = "";
    static int hold;

    private static Component frame;

    public static void main(String[] args)
    {

        rawInput = JOptionPane.showInputDialog("Enter a number between 0 and 9999.");
        int input = Integer.parseInt(rawInput);

        if(input == 0)
        {
            output += "Zero";
        }
        else if(input < 10)
        {
            output += ones(0);
        }
        else if(input < 20)
        {
            output += teens(0);
        }
        else if(input < 100)
        {
            output += tens(0);
            output += ones(1);
        }
        else if(input < 1000)
        {
            output += hundreds(0);
            int temp = Integer.parseInt(rawInput.substring(1,3));
            if(temp > 10 && temp < 20)
            {
                output += teens(2);
            }
            else
            {
                output += tens(1);
                output += ones(2);
            }

        }
        else if(input < 10000)
        {
            output += thousands(0);
            output += hundreds(1);
            int temp = Integer.parseInt(rawInput.substring(2,4));
            if(temp > 10 && temp < 20)
            {
                output += teens(3);
            }
            else
            {
                output += tens(2);
                output += ones(3);
            }

        }

        JOptionPane.showMessageDialog(frame, rawInput + " is" + output + ".");
        output = "";
        main(args);
    }

    public static String teens(int hold)
    {
        String[] teens = {"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen",
            "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nighteen"};
        int x = Character.getNumericValue(rawInput.charAt(hold));
        int y = 0;
        for(int i = 0; i < 10; i++)
        {
            if(i == x)
            {
                y = i;
                break;
            }
        }
        return " " + teens[y];
    }

    private static String tens(int hold)
    {
        String[] tens = {"", "Ten", "Twenty", "Thirty", "Fourty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"};
        int x = Character.getNumericValue(rawInput.charAt(hold));
        int y = 0;
        for(int i = 0; i < 10; i++)
        {
            if(i == x)
            {
                y = i;
            }
        }
        return  " " + tens[y];
    }

    private static String ones(int hold)
    {
        String[] ones = {"", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};
        int x = Character.getNumericValue(rawInput.charAt(hold));
        int y = 0;
        for(int i = 1; i < 10; i++)
        {
            if(i == x)
            {
                y = i;
                break;
            }
        }
        return " " + ones[y];
    }

    private static String hundreds(int hold)
    {
        return ones(hold) + " Hundred";
    }

    private static String thousands(int hold)
    {
        return ones(hold) + " Thousand";
    }
}

int input = Integer.parseInt(rawInput);

else if(input < 10)
    {
        output += ones(0);
    }
    else if(input < 20)
    {
        output += teens(0);
    }
    else if(input < 100)
    {
        output += tens(0);
        output += ones(1);
    }
    else if(input < 1000)
    {
        output += hundreds(0);
        int temp = Integer.parseInt(rawInput.substring(1,3));
        if(temp > 10 && temp < 20)
        {
            output += teens(2);
        }
        else
        {
            output += tens(1);
            output += ones(2);
        }

    }

if (input > 1000)
{
    output += thousands;
    subtract thousands from input;
}
if (input > 100)
{
    output += hundreds;
    subtract hundreds from input;
}
if (10 < input < 20)
{
    output += teens;
}
else
{
    if (input >= 20)
    {
        output += tens;
        subtract tens from input;
    }
    output += ones;
}
if (output is empty)
    output = "Zero";

int temp = Integer.parseInt(rawInput.substring(1,3));

main(args);

public static void main(String[] args)
{
    while (true)
        run();
}

static void run()
{
    rawInput = JOptionPane.showInputDialog("Enter a number between 0 and 9999.");
    ... etc ...
}

String getInput() {
  return JOptionPane.showInputDialog("Enter a number between 0 and 9999. q to Quit");
}

//...

String rawInput = getInput();
while (!rawInput.equal("q") {
  //...
  rawInput = getInput();
}

private static String suffix(String input, int index, String[] suffixes)
{
    int x = Character.getNumericValue(input.charAt(index));
    for(int i = 0; i < suffixes.length; i++)
    {
        if(i == x)
        {
            return " " + suffixes[i];
        }
    }
}

interface Converter {
 String convert(int value);
}

Map<Integer, Converter> converters = new LinkedHashMap<>();
converters.put(1, new ZeroConverter());
converters.put(10, new OnesConverter());
//...

for (Entry<Integer, Converter> e : converters.entrySet()) {
  if (input < e.getKey()) {
    output = e.getValue().convert(input);
    break;
  }
}