First, when you set up your button (any kind), you give
it whatever ActionListener you like.  Each button can have
its very own ActionListener with its very own actionPerformed()
method.

    Second, if you want several buttons to share the same
ActionListener and still want to make decisions based on which
button was activated, you can use the getSource() method of
the ActionEvent object.  (The ActionEvent has methods to fetch
other kinds of information, too.)

On the JRadioButtons and the JButtons you can make use of
addActionListener e.g.
JRadioButton button1 = new JRadioButton();
button1.addActionListener(new ActionListener() {
   public void actionPerformed(ActionEvent e) {

       // The code goes here
   }
});