guangan1.java

《Java语言程序设计》源代码 很好的JAVA入门的好的代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class guangan1 extends JPanel
{
	static JFrame frame;
	static String metal="Metal观感";
	static String motif="Motif观感";
	static String windows="Windows观感";
	JRadioButton metalButton,motifButton,windowsButton;
	public guangan1()
	{
		JButton button=new JButton("不同的观感效果");
		
		metalButton=new JRadioButton(metal);
		metalButton.setActionCommand(metal);
		
		motifButton=new JRadioButton(motif);
		motifButton.setActionCommand(motif);
		
		windowsButton=new JRadioButton(windows);
		windowsButton.setActionCommand(windows);
		
		//建立组
		ButtonGroup group=new ButtonGroup();
		group.add(metalButton);
		group.add(motifButton);
		group.add(windowsButton);
		
		//设置监听器
		RadioListener myListener=new RadioListener();
		metalButton.addActionListener(myListener);
		motifButton.addActionListener(myListener);
		windowsButton.addActionListener(myListener);
		
		add(button);
		add(metalButton);
		add(motifButton);
		add(windowsButton);
		
		

    }
    public static void main(String args[])
    {
    	JPanel panel=new guangan1();
    	frame=new JFrame("观感");
    	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	frame.getContentPane().add("Center",panel);
    	frame.setSize(450,70);
    	frame.setVisible(true);
    }

class RadioListener implements ActionListener
{
	public void actionPerformed(ActionEvent e)
	{
		if((e.getActionCommand()).equals(metal))
		   SetLAF.setJavaLookAndFeel();
		else if((e.getActionCommand()).equals(motif))
		   SetLAF.setMotifLookAndFeel();
		else SetLAF.setNativeLookAndFeel();
		SwingUtilities.updateComponentTreeUI(frame);
		frame.setSize(450,70);
	}
}
}
class SetLAF {
	public static void setNativeLookAndFeel()
	{
		try{
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		}catch(Exception e){
			System.out.println("设置NativeLAF错误："+e);
		}
	}
	public static void setJavaLookAndFeel()
	{
		try{
			UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
		}catch(Exception e){
			System.out.println("设置JavaLAF错误："+e);
		}
	}
	public static void setMotifLookAndFeel()
	{
		try{
			UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
		}catch(Exception e){
			System.out.println("设置MotifLAF错误："+e);
		}
	}
}