如何更改Swing窗口的默认图标？

下面的示例展示了如何在基于Swing的应用程序中更改窗口的默认图标。

使用以下API -

• ImageIcon - 创建图像图标。
• JFrame.setIconImage() - 将图标设置为窗口。

示例

package com.zaixian.swingdemo;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class SwingTester {
   public static void main(String[] args) {
      createWindow();   
   }

   private static void createWindow() {    
      JFrame frame = new JFrame("更改Swing窗口的默认图标");           
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      ImageIcon arrowIcon = null;

      java.net.URL imgURL = SwingTester.class.getResource("arrow.jpg");
      if (imgURL != null) {
         arrowIcon = new ImageIcon(imgURL);
         frame.setIconImage(arrowIcon.getImage());
      } else {
         JOptionPane.showMessageDialog(frame, "Icon image not found.");
      }

      createUI(frame);
      frame.setSize(560, 200);      
      frame.setLocationRelativeTo(null);  
      frame.setVisible(true);
   }

   private static void createUI(JFrame frame){      
      JPanel panel = new JPanel();
      LayoutManager layout = new FlowLayout();  
      panel.setLayout(layout);       
      panel.add(new JLabel("Welcome to xuhuhu.com!"));

      frame.getContentPane().add(panel, BorderLayout.CENTER);    
   }
}

执行上面示例代码，得到以下结果：