title: how to add actionlisters for 2 sets of radiobuttons
body: <p>I am making a frame with 3 panels. 1 panel has some text on it, 1 has radio buttons to alter the font that the saying appears in and the last panel has radio buttons to alter the size of the font. I have everything done, but I am confused as to how to add the action listener for the size radio buttons. Can anyone help me with this? The code for the actionlistener is near the bottom. Thank you very much!</p>
  
  <pre><code> import javax.swing.*;
  import java.awt.*;
  import java.awt.event.*;
  
  public class Layouts extends JPanel implements ActionListener
  {
      int style = Font.PLAIN;
      String font = "Arial";
      private JLabel saying, overAll, top, sizeP, fontP;
      private JPanel panel1, panel2, panel3, panel4;
      private JRadioButton style1, style2, style3, style4, size1, size2, size3, size4;
      //-----------------------------------------------------------------
      //  Sets up a panel with a label and some check boxes that
      //  control the style of the label's font.
      //-----------------------------------------------------------------
      public Layouts()
      {
          style1 = new JRadioButton ("Arial", true);
          style2 = new JRadioButton ("Times New Roman", false);
          style3 = new JRadioButton ("Verdana", false);
          style4 = new JRadioButton ("Thonburi", false);
  
          size1 = new JRadioButton ("36", false);
          size2 = new JRadioButton ("24", false);
          size3 = new JRadioButton ("20", false);
          size4 = new JRadioButton ("16", true);
  
          panel1 = new JPanel();
          panel2 = new JPanel();
          panel3 = new JPanel();
  
          saying = new JLabel ("Say it with style!");
          saying.setFont (new Font ("Helvetica", Font.PLAIN, 36)); // we'll need this later
  
          ButtonGroup group = new ButtonGroup(); //use this code for the homework
          group.add (style1);
          group.add (style2);
          group.add (style3); 
          group.add (style4);
  
          style1.addActionListener (this);
          style2.addActionListener (this);
          style3.addActionListener (this);
          style4.addActionListener (this);
  
          ButtonGroup group2 = new ButtonGroup();
          group.add(size1);
          group.add(size2);
          group.add(size3);
          group.add(size4);
  
          size1.addActionListener (this);
          size2.addActionListener (this);
          size3.addActionListener (this);
          size4.addActionListener (this);
  
          setBackground (Color.red);
          setPreferredSize (new Dimension(500, 100));
  
          setLayout(new BorderLayout());
          add(panel1, BorderLayout.NORTH);
          add(panel2, BorderLayout.EAST);
          add(panel3, BorderLayout.WEST);
  
          //add(panel2, East);
          //add(panel3, West);
  
          panel1.add(saying);
          panel1.setBackground(Color.yellow);
  
          panel2.setLayout(new GridLayout());
          panel2.setBackground(Color.red);
          panel2.add(style1);
          panel2.add(style2);
          panel2.add(style3);
          panel2.add(style4);
  
          panel3.setLayout(new BoxLayout(panel3, BoxLayout.Y_AXIS));
          panel3.setBackground(Color.red);
          panel3.add(size1);
          panel3.add(size2);
          panel3.add(size3);
          panel3.add(size4);
      }
      //*****************************************************************
      //  Represents the listener for both check boxes and the radio boxes.
      //*****************************************************************
      public void actionPerformed(ActionEvent e) // this is our bread and butter, it is basically what we will be changing
      {
          Object source = e.getSource();
  
          if (style1.isSelected())
              font = "Arial";
          else
              if (style2.isSelected())
                  font = "Times New Roman";
              else
                  if (style3.isSelected())
                      font = "Verdana";
                  else
                      if (style4.isSelected())
                          font = "Thonburi";
          saying.setFont(new Font (font, style, 36));
      }
      public static void main (String[] args)
      {
          JFrame frame = new JFrame ("Layouts");
          frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
  
          Layouts panel = new Layouts();
          frame.getContentPane().add(panel);
  
          frame.pack();
          frame.setVisible(true);
      }
  }
  </code></pre>