本程序通用调用UIManager.getInstalledLookAndFeels()方法来获取本机已安装的所有观感，然后分别创建相应数量的Button，用来动态改变观感。
相关API :
static voidsetLookAndFeel(LookAndFeelnewLookAndFeel)
设置观感
static voidupdateComponentTreeUI(Componentc)动态更新观感
static UIManager.LookAndFeelInfo[]getInstalledLookAndFeels()获取本机已安装的所有观感
执行效果：
代码：
package cn.youthol;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Main{/*** author bruce*/public static void main(String[] args){EventQueue.invokeLater(new Runnable(){public void run(){MyFrame frame = new MyFrame("Change LookAndFeel");frame.setDefaultCloseOperation(MyFrame.EXIT_ON_CLOSE);frame.setVisible(true);}});}}/** 框架窗口*/class MyFrame extends JFrame{private JPanel btnPanel;/** 构造方法*/public MyFrame(String title){//设置标题super(title);//设置大小setSize(800,600);//创建按钮面板btnPanel = new JPanel();add(btnPanel);//创建ButtonLookAndFeel[] names = getAllLookAndFeels();for(LookAndFeel name : names){createButton(name.name,name.className);}}/** 得到所有观感* LookAndFeel是自定义的类，用来存储观感信息*/private LookAndFeel[] getAllLookAndFeels(){UIManager.LookAndFeelInfo[] infos = UIManager.getInstalledLookAndFeels();LookAndFeel[] lafs = new LookAndFeel[infos.length];for(int i = 0 ; i < lafs.length ; ++i){lafs[i] = new LookAndFeel();}for(int i = 0 ; i < lafs.length ; ++i){System.out.println(i);lafs[i].className = infos[i].getClassName();lafs[i].name = infos[i].getName();}return lafs;}/** 创建Button*/private void createButton(String name,final String UIName){JButton btn = new JButton(name);btnPanel.add(btn);//设置监听器btn.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){//改变观感try{UIManager.setLookAndFeel(UIName);SwingUtilities.updateComponentTreeUI(MyFrame.this);}catch(Exception ex){ex.printStackTrace();}}});}/** 内部类LookAndFeel* 用来存储观感信息*/private class LookAndFeel{String className; //类名String name; //观感名}}
