Re: TextField

Michael Rauscher <>
Sat, 04 Nov 2006 01:48:16 +0100
man4*.* schrieb:

THX, I've modified you're code a litle bit and found what I was looking

So, I'm new in swing (new also in Java :-) ) and I was wondering....
I'm creating one let's call it aplication, with few buttons, TexFields,
RadioButt., comboBox...
right now, I'm creating classes for each component like:

class T1A implements ActionListener {
   public void actionPerformed(ActionEvent e) {
    tf1.setText(tf2.getText() );

and calling it with tt2.addActionListener(new T1A());

and now I have to code at least 10 new classes, is there any other way?

Depends. If you've got 10 completely different tasks then yes (forget
about if-else/switch-constructs to create whole-world-listeners).

In many cases you can reuse classes:

class TextSetterAction implements ActionListener {
     private JTextComponent tc1;
     private JTextComponent tc2;

     public TextSetterAction( JTextComponent tc1, JTextComponent tc2 ) {
         this.tc1 = tc1;
         this.tc2 = tc2;

     public void actionPerformed( ActionEvent e ) {
         tc1.setText( tc2.getText() );

TextSetterAction tf1tf2Setter = new TextSetterAction(tf1,tf2);
tt2.addActionListener( tf1tf2Setter );
tt3.addActionListener( new TextSetterAction(tf3, tf4) );

Of course, you can reuse objects, too:

tt4.addActionListener( tf1tf2Setter );

There are more ways to make life easier (e. g. JComponent's client
property) but it depends on the situation.


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