Угадайте о матических проблемах

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У меня возникла проблема с моей текстовой областью/полем make a guess. Я могу ввести все, что захочу, но когда я нажимаю enter, я получаю ошибку в консоли.

да. моя плохая ошибка заключается в том, что

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: ""
 at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
 at java.lang.Integer.parseInt(Integer.java:592)
 at java.lang.Integer.parseInt(Integer.java:615)
 at gom.GOM.newGuess(GOM.java:175)
 at gom.GOM.keyReleased(GOM.java:147)
 at java.awt.Component.processKeyEvent(Component.java:6494)
 at javax.swing.JComponent.processKeyEvent(JComponent.java:2832)
 at java.awt.Component.processEvent(Component.java:6310)
 at java.awt.Container.processEvent(Container.java:2236)
 at java.awt.Component.dispatchEventImpl(Component.java:4889)
 at java.awt.Container.dispatchEventImpl(Container.java:2294)
 at java.awt.Component.dispatchEvent(Component.java:4711)
 at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
 at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:806)
 at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1074)
 at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:945)
 at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:771)
 at java.awt.Component.dispatchEventImpl(Component.java:4760)
 at java.awt.Container.dispatchEventImpl(Container.java:2294)
 at java.awt.Window.dispatchEventImpl(Window.java:2746)
 at java.awt.Component.dispatchEvent(Component.java:4711)
 at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
 at java.awt.EventQueue.access$500(EventQueue.java:97)
 at java.awt.EventQueue$3.run(EventQueue.java:709)
 at java.awt.EventQueue$3.run(EventQueue.java:703)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
 at java.awt.EventQueue$4.run(EventQueue.java:731)
 at java.awt.EventQueue$4.run(EventQueue.java:729)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

вот и вся ошибка, которую я получаю

Что я уже пробовал:

package gom;

/**
 *
 * @author stephenwessels
 */
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
import java.util.Scanner;
import javax.swing.*;
public class GOM extends JFrame implements ActionListener, KeyListener
{

    Scanner in = new Scanner(System.in);
    
    Container content = this.getContentPane();
    JTextField theGuess = new JTextField();
    JLabel bankRoll = new JLabel("100.00 Zipoids");
    JLabel d1 = new JLabel("  ");
    JLabel d2 = new JLabel("  ");
    JButton newPlayer = new JButton("New Player");
    JButton newNumber = new JButton("New Number");
    JTextField thePlayer = new JTextField();
    JTextArea theOutput = new JTextArea("Enter your name" + "\n" + "Press ENTER to play");
    JPanel p1 = new JPanel();
    JPanel p2 = new JPanel();
    JScrollPane scrollArea = new JScrollPane(theOutput);
    
    Random randomizer = new Random();
    String playerName = "";
    int theNumber = 20;
    int numTries = 0;
    int numGames = 0;
    double amtRemaining = 100.0;
    
    
    
    public GOM()
    {
        JLabel guess = new JLabel("Make your guess:");
        
        this.setVisible(true);
        this.setSize(500,400);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("Guess O'Matic");

        content.add(p1, BorderLayout.NORTH);
        p1.setLayout(new BorderLayout());
        p1.add(bankRoll, BorderLayout.EAST);
        p1.add(guess, BorderLayout.WEST);
        p1.add(theGuess);
        
        content.add(p2, BorderLayout.SOUTH);
        p2.setLayout(new BorderLayout());
        p2.add(thePlayer);
        p2.add(newPlayer, BorderLayout.WEST);
        p2.add(newNumber, BorderLayout.EAST);
        
        content.add(scrollArea, BorderLayout.CENTER);
        content.add(d1, BorderLayout.WEST);
        content.add(d2, BorderLayout.EAST);
        
        newPlayer.addActionListener(this);
        newNumber.addActionListener(this);
        
        thePlayer.addKeyListener(this);
        theGuess.addKeyListener(this);
        
        theOutput.setForeground(Color.LIGHT_GRAY);
        
        
        
    }
    
    public void actionPerformed(ActionEvent e) 
    {
        JButton btn = (JButton) e.getSource();
        if (btn == newPlayer) 
        {
            this.newPlayer();
        }else 
        {
            newGame();
            thePlayer.setText(playerName + " Game # " + numGames);
            theGuess.requestFocus();
            theGuess.setEnabled(true);
            theGuess.setBackground(Color.yellow);
        }
        
           
    }
    
     private void newGame() 
     {
         numGames++;
         randomizer.nextInt(100);
         numTries = 0;
         displayInstructions();
         
     }
    
    public void newPlayer()
    {
        theOutput.setText("");
        
        theOutput.setEnabled(false);
        theGuess.setEnabled(false);
        newPlayer.setEnabled(false);
        newNumber.setEnabled(false);
        
        thePlayer.setEnabled(true);
        thePlayer.setText(playerName);
    }
    
    
    
     @Override
    public void keyTyped(KeyEvent ke) 
    {
        
    }

    @Override
    public void keyPressed(KeyEvent ke) 
    {
        
    }

    @Override
    public void keyReleased(KeyEvent ke) 
    {
        JTextField tf = (JTextField) ke.getSource();
        int key = ke.getKeyCode();
        if(key == KeyEvent.VK_ENTER)
        {
            if(tf == thePlayer)
            {
                addPlayer();
            }else
            {
                newGuess();
            }
        }
    }
    
    public void addPlayer()
    {
        playerName = thePlayer.getText();
       if(playerName.equals(""))
       {
           theOutput.append("\nEnter a name to play");
       }else
       {
           amtRemaining = 100;
           numGames = 0;
           thePlayer.setEnabled(false);
           thePlayer.setBackground(Color.WHITE);
           newPlayer.setEnabled(true);
           newNumber.setEnabled(true);
           theGuess.setEnabled(true);
       }
    }
    
    private void newGuess() 
    {
        String curStr = "";
        int curGuess = 0;
        
        Integer.parseInt(curStr);
        numTries++;
        theOutput.append(curStr);
        if(theNumber == curGuess)
        {
            gameWon();
        }else
        {
            theOutput.append("Try a higher or lower number");
            theGuess.requestFocus();
            theGuess.setBackground(Color.yellow);
            theGuess.selectAll();
        }
    }
    
    public void gameWon()
    {
        double curWinnings = 0;
        
        theOutput.setText("******* WINNER ********" + "\n" + "Amount Wagered ");
        theOutput.append("Amount of tries " + numTries + "\n" + "Amount Wagered: " + curWinnings);
        switch(numTries)
        {
            case 1:
                if(numTries == 1)
                {
                    curWinnings = 2.00;
                }
            case 2:
                if(numTries == 2)
                {
                    curWinnings = 1.75;
                }
                case 3:
                if(numTries == 3)
                {
                    curWinnings = 1.50;
                }
                case 4:
                if(numTries == 4)
                {
                    curWinnings = 1.25;
                }
                case 5:
                if(numTries == 5)
                {
                    curWinnings = 1.00;
                }
                case 6:
                if(numTries == 6)
                {
                    curWinnings = 0.75;
                }
                case 7:
                if(numTries == 7)
                {
                    curWinnings = 0.50;
                }
                case 8:
                if(numTries == 8)
                {
                    curWinnings = 0.25;
                }
                case 9:
                if(numTries == 9)
                {
                    curWinnings = 0;
                }
            default:
                
        }
    }
    
     private void displayInstructions() 
    {
        theOutput.append("Instructions test text");
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) 
    {
        GOM gui = new GOM();
    }
    
}

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