UserNameTextBox = new JTextField(); UserNameTextBox.setHorizontalAlignment(SwingConstants.CENTER); UserNameTextBox.setBounds(562, 326, 119, 20); contentPane.add(UserNameTextBox); UserNameTextBox.setColumns(10); UserNameTextBox.getDocument().addDocumentListener(new DocumentListener() { public void changedUpdate(DocumentEvent e) { UserNameTextBox.setBackground(Color.red); } public void removeUpdate(DocumentEvent e) { UserNameTextBox.setBackground(Color.red); } public void insertUpdate(DocumentEvent e) { UserNameTextBox.setBackground(Color.red); } });
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