Java JTextArea - Adding a newline

Question

So I\'m stumped. I, for some reason, seem to remember that Java does weird things when you try to add new lines to stuff... so I think that may be the problem here.

Thi

Answer 1

EDIT: After I see your full code, your keylistener is working. The problem is: outputArea.setText(txt); who overwrites your linebreaks. Try something like this:

public void displayText(KeyEvent k){
    txt = inputArea.getText();
    char key = k.getKeyChar();
    if(key != KeyEvent.VK_ENTER)
        outputArea.append(Character.toString(k.getKeyChar()));
    else {
        // do something special, then add a linebreak
        outputArea.append("\n");
    }
}

ORIGINAL ANSWER: Try using getKeyChar() instead of getKeyCode(). See http://java.sun.com/j2se/1.5.0/docs/api/java/awt/event/KeyEvent.html for when to use what. Also, since you are just testing on enter, you probarly won't need to use a KeyListener. You can use a ActionListener on the input-field instead. See sample code for both ActionListener and KeyListener solutions below.

public class JTextAreaTest extends JFrame{
private JTextArea txaConsole;
private JTextField txtInput;
private JButton btnSubmit;

public JTextAreaTest(){
    SubmitListener submitListener = new SubmitListener();
    MyKeyListener myKeyListener = new MyKeyListener();

    txaConsole = new JTextArea(10,40);
    txtInput = new JTextField();
    txtInput.addActionListener(submitListener);
    //txtInput.addKeyListener(myKeyListener);
    btnSubmit = new JButton("Add");
    btnSubmit.addActionListener(submitListener);

    add(new JScrollPane(txaConsole), BorderLayout.NORTH);
    add(txtInput, BorderLayout.CENTER);
    add(btnSubmit, BorderLayout.EAST);


    setDefaultCloseOperation(EXIT_ON_CLOSE);
    pack();
    setVisible(true);
    txtInput.requestFocusInWindow();
}

private void addInputToConsole(){
    String input = txtInput.getText().trim();
    if(input.equals("")) return;

    txaConsole.append(input + "\n");
    txtInput.setText("");
}

// You don't need a keylistener to listen on enter-presses. Use a
// actionlistener instead, as shown below.
private class MyKeyListener extends KeyAdapter {
    @Override
    public void keyTyped(KeyEvent e) {
        if(e.getKeyChar() == KeyEvent.VK_ENTER)
            addInputToConsole();
    }
}

private class SubmitListener implements ActionListener{
    @Override
    public void actionPerformed(ActionEvent e) {
        addInputToConsole();
    }
}

public static void main(String[] args) {
    new JTextAreaTest();
}
}