BorderLayoutDemo.java

// Fig. 12.41_42: BorderLayoutDemo.java
// BorderLayout containing five buttons.
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JButton;

class BorderLayoutFrame extends JFrame implements ActionListener 
{
   private final JButton[] buttons; // array of buttons to hide portions
   private static final String[] names = {"Hide North", "Hide South", 
      "Hide East", "Hide West", "Hide Center"};
   private final BorderLayout layout; 

   // set up GUI and event handling
   public BorderLayoutFrame()
   {
      super("BorderLayout Demo");

      layout = new BorderLayout(5, 5); // 5 pixel gaps
      setLayout(layout);
      buttons = new JButton[names.length]; 

      // create JButtons and register listeners for them
      for (int count = 0; count < names.length; count++) 
      {
         buttons[count] = new JButton(names[count]);
         buttons[count].addActionListener(this);
      }

      add(buttons[0], BorderLayout.NORTH); 
      add(buttons[1], BorderLayout.SOUTH); 
      add(buttons[2], BorderLayout.EAST); 
      add(buttons[3], BorderLayout.WEST); 
      add(buttons[4], BorderLayout.CENTER);
   } // end BorderLayoutFrame constructor

   // handle button events
   @Override
   public void actionPerformed(ActionEvent event)
   {
      // check event source and lay out content pane correspondingly
      for (JButton button : buttons)
      {
         if (event.getSource() == button)
            button.setVisible(false); // hide the button that was clicked
         else
            button.setVisible(true); // show other buttons
      }

      layout.layoutContainer(getContentPane()); // lay out content pane
   }
} // end class BorderLayoutFrame
public class BorderLayoutDemo 
{
   public static void main(String[] args)
   { 
      BorderLayoutFrame borderLayoutFrame = new BorderLayoutFrame(); 
      borderLayoutFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      borderLayoutFrame.setSize(300, 200); 
      borderLayoutFrame.setVisible(true); 
   } 
} // end class BorderLayoutDemo