Swing：元件：JButton, JOptionPane

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

class Frame6 extends JFrame{
 private JPanel contentPane;
 private JButton button;
 Frame6(){
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setBounds(200,200,450,300);
  setTitle("Swing JFrame 視窗");
  
  contentPane = new JPanel();
  contentPane.setLayout(null);
  setContentPane(contentPane);
  
  button = new JButton("錯誤訊息");
  button.setBounds(100, 80, 100, 50);
  button.addActionListener(new ActionListener (){

   @Override
   public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    JOptionPane.showMessageDialog(null, "錯誤資訊","錯誤資訊視窗",JOptionPane.ERROR_MESSAGE);
   }
      
   });
  
  contentPane.add(button);
  
  setVisible(true);
 }
}

public class FrameOptionPane {

 public static void main(String[] args) {
  Frame6 frame = new Frame6();
 }

}

執行結果

點選按鈕

訊息種類

Message Type常數	圖示
ERROR_MESSAGE
INFORMATION_MESSAGE
WARNING_MESSAGE
QUESTION_MESSAGE
PLAIN_MESSAGE	沒有圖示