Java help

[k_rock923]

I wrote a class for an input dialog for a word game assignment. It uses a password field so that the other player can't guess the sercret word as the first player types it in. However, my actionPerformed method in this class always throws an exception. Specifically, the getPassword() method does. I don't understand what I'm doing wrong. Any ideas?

code:


class CustomInputDialog extends JDialog implements ActionListener

{

private JLabel prompt;

private JPasswordField input;

private JButton ok;

private String userInput = new String("word");



public CustomInputDialog(Frame owner, String title, boolean modal)

{

super(owner, title, modal);

JPasswordField input = new JPasswordField(30);

input.setEchoChar('*');

JPanel screen = new JPanel(new FlowLayout());

ok = new JButton("OK");

prompt = new JLabel("Enter a word");

setDefaultCloseOperation(DISPOSE_ON_CLOSE);



ok.addActionListener(this);



this.setModal(modal);

this.setResizable(false);



getContentPane().add(screen);



screen.add(prompt);

screen.add(input);

screen.add(ok);

pack();

}



public void actionPerformed(ActionEvent event)

{

char[] userString = null;

userString = input.getPassword();



StringBuffer temp = new StringBuffer();



for(int i = 0; i < userString.length; i++)

	{

	temp.append(userString[i]);

	}



userInput = temp.toString();

JOptionPane.showMessageDialog(null,"here");

this.setVisible(false);

}



public String getText()

{

this.setVisible(true);

return userInput;

}



}

this is how I call it. I'm not sure if this is correct either. . .

code:


CustomInputDialog d = new CustomInputDialog(null, "Input", true);

word = d.getText();

word is a String instance variable of the class for the game UI. THanks in advance

//this was supposed to be in GD. oops.

[edit > JonnyMac] Now, it is in GD [/edit]

[sgtfuzzbubble011]

Damn, you're quick JM. I didn't even get a chance to reply to his PM before it was moved. :P

[k_rock923]

Hey JM! nice to see you. how's tech support holding up? I really wish I could help out in there as much as I used to, but I've been really busy with college lately.

[JonnyMac]

Hi sarge

I was looking in Who's Online and saw k_rock posting a new thread in TS.
k_rock posting a new thread in TS??? I It must be a case of temporary insanity.

Hi k_rock

WATS, has been ok lately and I have been taking it easy over there. No probs. I appreciate the help, but understand the need to devote more time to college. Good luck.

[zootm]

What's the exception it throws?

[k_rock923]

a NullPointer

however, it works when i do the following in the actionPerformed

JPasswordField input = (JPasswordField)e.getSource();
userString = input.getPassword();


now i'm very confused. I have no idea why i would need to do that.