// Fig. 22.9: LookAndFeelFrame.java
// Changing the look and feel.
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import javax.swing.JFrame;
import javax.swing.UIManager;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JComboBox;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;

public class LookAndFeelFrame extends JFrame 
{
   // string names of look and feels
   private final String strings[] = { "Metal", "Motif", "Windows" };
   private UIManager.LookAndFeelInfo looks[]; // look and feels
   private JRadioButton radio[]; // radio buttons to select look-and-feel
   private ButtonGroup group; // group for radio buttons
   private JButton button; // displays look of button
   private JLabel label; // displays look of label
   private JComboBox comboBox; // displays look of combo box

   // set up GUI
   public LookAndFeelFrame()
   {
      super( "Look and Feel Demo" );

      JPanel northPanel = new JPanel(); // create north panel
      northPanel.setLayout( new GridLayout( 3, 1, 0, 5 ) );

      label = new JLabel( "This is a Metal look-and-feel",
         SwingConstants.CENTER ); // create label
      northPanel.add( label ); // add label to panel

      button = new JButton( "JButton" ); // create button
      northPanel.add( button ); // add button to panel

      comboBox = new JComboBox( strings ); // create combobox
      northPanel.add( comboBox ); // add combobox to panel
     
      // create array for radio buttons
      radio = new JRadioButton[ strings.length ];

      JPanel southPanel = new JPanel(); // create south panel
      southPanel.setLayout( new GridLayout( 1, radio.length ) );

      group = new ButtonGroup(); // button group for looks-and-feels
      ItemHandler handler = new ItemHandler(); // look-and-feel handler

      for ( int count = 0; count < radio.length; count++ ) 
      {
         radio[ count ] = new JRadioButton( strings[ count ] );
         radio[ count ].addItemListener( handler ); // add handler
         group.add( radio[ count ] ); // add radio button to group
         southPanel.add( radio[ count ] ); // add radio button to panel
      } // end for

      add( northPanel, BorderLayout.NORTH ); // add north panel
      add( southPanel, BorderLayout.SOUTH ); // add south panel

      // get installed look-and-feel information
      looks = UIManager.getInstalledLookAndFeels();
      radio[ 0 ].setSelected( true ); // set default selection
   } // end LookAndFeelFrame constructor

   // use UIManager to change look-and-feel of GUI
   private void changeTheLookAndFeel( int value )
   {
      try // change look-and-feel
      {
         // set look-and-feel for this application
         UIManager.setLookAndFeel( looks[ value ].getClassName() );

         // update components in this application
         SwingUtilities.updateComponentTreeUI( this );
      } // end try
      catch ( Exception exception ) 
      {
         exception.printStackTrace();
      } // end catch
   } // end method changeTheLookAndFeel

   // private inner class to handle radio button events
   private class ItemHandler implements ItemListener 
   {
      // process user's look-and-feel selection
      public void itemStateChanged( ItemEvent event )
      {
         for ( int count = 0; count < radio.length; count++ )
         {
            if ( radio[ count ].isSelected() ) 
            {
               label.setText( String.format( "This is a %s look-and-feel", 
                  strings[ count ] ) );
               comboBox.setSelectedIndex( count ); // set combobox index
               changeTheLookAndFeel( count ); // change look-and-feel
            } // end if
         } // end for
      } // end method itemStateChanged
   } // end private inner class ItemHandler
} // end class LookAndFeelFrame



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