package com.hongyuan.gui; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class PlafTest {  public static void main(String[] args) {   EventQueue.invokeLater(new Runnable() {    @Override    public void run() {     PlafFrame frame=new PlafFrame();     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     frame.setVisible(true);    }   });  } } class PlafFrame extends JFrame {  private JPanel buttonPanel;  public PlafFrame(){   this.setTitle("PlafTest");   this.setSize(400, 300);   buttonPanel=new JPanel();   //查询观感并生成按钮   UIManager.LookAndFeelInfo[] infos=UIManager.getInstalledLookAndFeels();   for(UIManager.LookAndFeelInfo info:infos){    makeButton(info.getName(),info.getClassName());   }   this.add(buttonPanel);  }  void makeButton(String name,final String plafName){   JButton button=new JButton(name);   buttonPanel.add(button);   button.addActionListener(new ActionListener() {    @Override    public void actionPerformed(ActionEvent e) {     try {      //设置观感并更新组件      UIManager.setLookAndFeel(plafName);      SwingUtilities.updateComponentTreeUI(PlafFrame.this);     } catch (ClassNotFoundException | InstantiationException       | IllegalAccessException       | UnsupportedLookAndFeelException e1) {      e1.printStackTrace();     }    }   });  } }