顯示帶“是”、“否”按鈕的確認對話方塊

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”選項的確認對話方塊。

我們正在使用以下 API。

• JOptionPane − 建立標準對話方塊。

• JOptionPane.showConfirmDialog() − 顯示確認訊息框。

• JOptionPane.YES_NO_OPTION − 獲取“是”和“否”按鈕。

示例

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 Tester");
      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("Click Me!");
      final JLabel label = new JLabel();
      button.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            int result = JOptionPane.showConfirmDialog(frame,"Sure? You want to exit?", "Swing Tester",
               JOptionPane.YES_NO_OPTION,
               JOptionPane.QUESTION_MESSAGE);
            if(result == JOptionPane.YES_OPTION){
               label.setText("You selected: Yes");
            }else if (result == JOptionPane.NO_OPTION){
               label.setText("You selected: No");
            }else {
               label.setText("None selected");
            }
         }
      });

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

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