jtextfield

Which type of Listener do I use for listening to changed text events in a JTextField ? (I should know this or be able to tell from the Javadoc but I can't seem to figure it out.) Use the underlying document: myTextField.getDocument().addDocumentListener(); 来源： https://stackoverflow.com/questions/2165071/swing-appropriate-listener-for-jtextfield-change-events

How can I add some padding to a jtextfield? I've tried tf.setMargin(new Insets(5,5,5,5)); which doesn't have any effect. The problem you are having is that the UI is setting its own border on the text field, overriding the margin you set. You can see a warning to this effect in the javadoc of setMargin() . The solution is to let the UI set a border, then squeeze in another border of your own: field.setBorder(BorderFactory.createCompoundBorder( field.getBorder(), BorderFactory.createEmptyBorder(5, 5, 5, 5))); you have look at CompoundBorder , there you can set LineBorder(Color.gray, 1) and with

I have an app that is written in Swing, awt. I want to prevent users from pasting values into the textfields. is there any way to do this without using action listeners? You can just call setTransferHandler with a null parameter like this: textComponent.setTransferHandler(null); This will disable all copy/paste actions on the field. The best way is to remove action associated with CTRL+V keystroke in components ActionMap. Rob The simplest way it to say: textComponent.setEditable(false); This disables cut & paste, but copy is still enabled. public class PastlessJTextField extends JTextField {