JOptionPane Help

[adjit]

so this should all take place within my NumbersToWords class?

[quad64bit]

Sure, it can really happen anywhere.

[adjit]

okay, so I got it working, and now everytime I use it, it works fine, however I keep getting errors.
this is the error I keep getting, it happens when I remove the text in the box:

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "4Type Here"
	at java.lang.NumberFormatException.forInputString(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at java.lang.Integer.parseInt(Unknown Source)
	at NumbersToWords$LiveListener.keyReleased(NumbersToWords.java:33)
	at java.awt.Component.processKeyEvent(Unknown Source)
	at javax.swing.JComponent.processKeyEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

here are my methods:

JTextField input, output;
	
	public void LivePrint()
	{
		JFrame window = new JFrame("Live Printer");
		JPanel livePanel = new JPanel();
		input = new JTextField("Type Here", 30);
		input.addKeyListener(new LiveListener());
		output = new JTextField("Output happens here live!", 30);
		
		livePanel.add(input);
		livePanel.add(output);
		
		window.add(livePanel);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.pack();
		window.setLocationRelativeTo(null);
		
		window.setVisible(true);
	}
	
	class LiveListener implements KeyListener
	{
		public void keyType(KeyEvent keyEvent){}
		public void keyPressed(KeyEvent keyEvent){}
		public void keyReleased(KeyEvent keyEvent)
		{
			int number = Integer.parseInt(input.getText());
			output.setText(input(number));
		}
		@Override
		public void keyTyped(KeyEvent arg0) {
			// TODO Auto-generated method stub
			
		}
	}

[quad64bit]

NumberformatException happens when you try to convert letters into a number. You should do a try/catch block so when that happens, you can pop up a message to the user and tell then to enter only numbers.