trying to use radio buttons

assignments/a3/src/main/java/Controls.java

@@ -12,8 +12,8 @@ public class Controls extends JPanel implements Observer
 {
   private Model model;
   private JSlider rating;
-  private JButton grid;
-  private JButton list;
+  private JRadioButton grid;
+  private JRadioButton list;
   private BufferedImage starImg;
   private BufferedImage gridImg;
   private BufferedImage listImg;
@@ -51,7 +51,7 @@ public class Controls extends JPanel implements Observer
     this.gridIcon = new ImageIcon(gridImg);
     this.listIcon = new ImageIcon(listImg);
     
-    this.grid = new JButton(gridIcon);
+    this.grid = new JRadioButton(gridIcon, true);
     grid.addActionListener(new ActionListener()
     {
       public void actionPerformed(ActionEvent e)
@@ -60,7 +60,7 @@ public class Controls extends JPanel implements Observer
       }
     });
     
-    this.list = new JButton(listIcon);
+    this.list = new JRadioButton(listIcon, false);
     list.addActionListener(new ActionListener()
     {
       public void actionPerformed(ActionEvent e)