How to change the look and feel of Swing applications : UI « Swing JFC « Java

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Java » Swing JFC » UIScreenshots 
How to change the look and feel of Swing applications
  



import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.SwingConstants;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class Main extends JFrame {

  private String strings[] "Metal""Motif""Windows" };

  private UIManager.LookAndFeelInfo looks[] = UIManager.getInstalledLookAndFeels();

  private JRadioButton radio[] new JRadioButton[strings.length];
  private JButton button = new JButton("JButton");

  private JLabel label= new JLabel("This is a Metal look-and-feel", SwingConstants.CENTER);

  private JComboBox comboBox = new JComboBox(strings);

  public Main() {
    JPanel northPanel = new JPanel();
    northPanel.setLayout(new GridLayout(3105));
    northPanel.add(label);    
    northPanel.add(button);    
    northPanel.add(comboBox);
    add(northPanel, BorderLayout.NORTH);
    JPanel southPanel = new JPanel();
    
    ItemHandler handler = new ItemHandler();
    southPanel.setLayout(new GridLayout(1, radio.length));

    ButtonGroup group = new ButtonGroup();
    for (int i = 0; i < radio.length; i++) {
      radio[inew JRadioButton(strings[i]);
      radio[i].addItemListener(handler);
      group.add(radio[i]);
      southPanel.add(radio[i]);
    }

    add(southPanel, BorderLayout.SOUTH);
    
    setSize(300200);
    setVisible(true);
    radio[0].setSelected(true);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

  private void changeTheLookAndFeel(int value) {
    try {
      UIManager.setLookAndFeel(looks[value].getClassName());
      SwingUtilities.updateComponentTreeUI(this);
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static void main(String args[]) {
    Main dx = new Main();
  }

  private class ItemHandler implements ItemListener {
    public void itemStateChanged(ItemEvent e) {
      for (int i = 0; i < radio.length; i++)
        if (radio[i].isSelected()) {
          label.setText("This is a " + strings[i" look-and-feel");
          comboBox.setSelectedIndex(i);
          changeTheLookAndFeel(i);
        }
    }
  }
}

   
    
  
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5. UIManager defaultsUIManager defaults
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