如何在Swing中顯示是/否選項的確認對話框？

以下示例展示如何在基於swing的應用程式中顯示帶有是和否選項的確認對話框。

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_OPTION - 獲得是和否按鈕。

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是/否確認對話框");
      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~");
      final JLabel label = new JLabel();
      button.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            int result = JOptionPane.showConfirmDialog(frame,"您確定要退出？", "Swing是/否確認對話框",
               JOptionPane.YES_NO_OPTION,
               JOptionPane.QUESTION_MESSAGE);
            if(result == JOptionPane.YES_OPTION){
               label.setText("選擇：是");
            }else if (result == JOptionPane.NO_OPTION){
               label.setText("選擇：否");
            }else {
               label.setText("未選擇~");
            }
         }
      });

      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：