如何在Swing中顯示是/否和取消選項的確認對話框？

下麵的示例展示如何在基於swing的應用程式中顯示帶有是，否和取消選項的確認對話框。

使用以下API -

• JOptionPane - 創建標準對話框。
• JOptionPane.showConfirmDialog() - 顯示確認消息框。
• JOptionPane.YES_NO_CANCEL_OPTION - 獲取是，否和取消按鈕。

示例

package com.zaixian.swingdemo;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
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("Swing確認對話框示例(xuhuhu.com)");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      createUI(frame);
      frame.setSize(560, 200);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   private static void createUI(final JFrame frame){
      JPanel panel = new JPanel();
      LayoutManager layout = new FlowLayout();
      panel.setLayout(layout);

      JButton button = new JButton("點擊我~");
      final JLabel label = new JLabel();
      button.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            int result = JOptionPane.showConfirmDialog(frame,"確定要退出?", "Swing對話框",
               JOptionPane.YES_NO_CANCEL_OPTION,
               JOptionPane.QUESTION_MESSAGE);
            if(result == JOptionPane.YES_OPTION){
               label.setText("你選擇了: 是");
            }else if (result == JOptionPane.NO_OPTION){
               label.setText("你選擇了: 否");
            }else if (result == JOptionPane.CANCEL_OPTION){
               label.setText("你選擇了: 取消");
            }else {
               label.setText("什麼也沒有選擇！");
            }
         }
      });

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

執行上面示例代碼，得到以下結果：