java 监听单选按钮_JRadioButton（单选按钮）添加事件监听

要为Java中的单选按钮（JRadioButton）添加事件监听器，可以使用ActionListener接口和addActionListener()方法。

以下是一个简单的示例代码，展示如何在单选按钮（JRadioButton）上添加事件监听器：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class RadioButtonExample extends JFrame implements ActionListener {
   private JRadioButton radioButton1, radioButton2, radioButton3;
   private ButtonGroup buttonGroup;

   public RadioButtonExample() {
      setTitle("Radio Button Example");
      setSize(400, 300);
      setDefaultCloseOperation(EXIT_ON_CLOSE);

      // 创建单选按钮并添加到按钮组中
      radioButton1 = new JRadioButton("Option 1");
      radioButton2 = new JRadioButton("Option 2");
      radioButton3 = new JRadioButton("Option 3");
      buttonGroup = new ButtonGroup();
      buttonGroup.add(radioButton1);
      buttonGroup.add(radioButton2);
      buttonGroup.add(radioButton3);

      // 添加事件监听器
      radioButton1.addActionListener(this);
      radioButton2.addActionListener(this);
      radioButton3.addActionListener(this);

      // 将单选按钮添加到窗口中
      JPanel panel = new JPanel(new GridLayout(0, 1));
      panel.add(radioButton1);
      panel.add(radioButton2);
      panel.add(radioButton3);
      add(panel, BorderLayout.CENTER);
   }

   public void actionPerformed(ActionEvent e) {
      // 处理单选按钮事件
      if (e.getSource() == radioButton1) {
         System.out.println("Option 1 selected.");
      } else if (e.getSource() == radioButton2) {
         System.out.println("Option 2 selected.");
      } else if (e.getSource() == radioButton3) {
         System.out.println("Option 3 selected.");
      }
   }

   public static void main(String[] args) {
      RadioButtonExample example = new RadioButtonExample();
      example.setVisible(true);
   }
}

在上面的示例中，创建了三个单选按钮，并将它们添加到单选按钮组中。然后，使用addActionListener()方法为每个单选按钮添加事件监听器。当用户点击任何一个单选按钮时，actionPerformed()方法将被调用，并根据所选的选项执行相应的操作。