java观感实例

java核心技术中提供的关于java观感的实例,该实例查询并生成了系统中存在观感对应的按钮并在用户点击相应按钮时将窗口的观感切换到指定的观感上。

[文件] PlafTest.java
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();
                }
            }
        });
    }
}