MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class MainClass {
    protected JFrame theFrame = new JFrame("LNF Switcher");

    protected Container cp;

    protected String curLF = "javax.swing.plaf.metal.MetalLookAndFeel";

    protected JRadioButton previousButton;

    public MainClass() {
        theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        cp = theFrame.getContentPane();
        cp.setLayout(new FlowLayout());

        ButtonGroup bg = new ButtonGroup();

        JRadioButton bJava = new JRadioButton("Java");
        bJava.addActionListener(new LNFSetter("javax.swing.plaf.metal.MetalLookAndFeel", bJava));
        bg.add(bJava);
        cp.add(bJava);

        JRadioButton bMSW = new JRadioButton("MS-Windows");
        bMSW.addActionListener(new LNFSetter("com.sun.java.swing.plaf.windows.WindowsLookAndFeel", bMSW));
        bg.add(bMSW);
        cp.add(bMSW);

        JRadioButton bMotif = new JRadioButton("Motif");
        bMotif.addActionListener(new LNFSetter("com.sun.java.swing.plaf.motif.MotifLookAndFeel", bMotif));
        bg.add(bMotif);
        cp.add(bMotif);

        JRadioButton bMac = new JRadioButton("Sun-MacOS");
        bMac.addActionListener(new LNFSetter("com.sun.java.swing.plaf.mac.MacLookAndFeel", bMac));
        bg.add(bMac);
        cp.add(bMac);

        String defaultLookAndFeel = UIManager.getSystemLookAndFeelClassName();
        JRadioButton bDefault = new JRadioButton("Default");
        bDefault.addActionListener(new LNFSetter(defaultLookAndFeel, bDefault));
        bg.add(bDefault);
        cp.add(bDefault);

        (previousButton = bDefault).setSelected(true);

        theFrame.pack();
        theFrame.setVisible(true);
    }

    class LNFSetter implements ActionListener {
        String theLNFName;

        JRadioButton thisButton;

        LNFSetter(String lnfName, JRadioButton me) {
            theLNFName = lnfName;
            thisButton = me;
        }

        public void actionPerformed(ActionEvent e) {
            try {
                UIManager.setLookAndFeel(theLNFName);
                SwingUtilities.updateComponentTreeUI(theFrame);
                theFrame.pack();
            } catch (Exception evt) {
                JOptionPane.showMessageDialog(null, "setLookAndFeel didn't work: " + evt, "UI Failure",
                        JOptionPane.INFORMATION_MESSAGE);
                previousButton.setSelected(true); // reset the GUI to agree
            }
            previousButton = thisButton;
        }
    }

    public static void main(String[] argv) {
        new MainClass();
    }
}