Swing 示例 - 建立單選按鈕組

以下示例展示如何在 Java Swing 應用程式中將標準單選按鈕用作一組。

我們正在使用以下 API。

• ButtonGroup − 建立按鈕組。

• ButtonGroup.add(); − 將單選按鈕新增到組中。

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 java.awt.event.KeyEvent;

import javax.swing.ButtonGroup;
import javax.swing.JRadioButton;
import javax.swing.JFrame;
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);       

      JRadioButton radioButton1 = new JRadioButton("Radio Button 1");
      JRadioButton radioButton2 = new JRadioButton("Radio Button 2");
      JRadioButton radioButton3 = new JRadioButton("Radio Button 3");

      ButtonGroup group = new ButtonGroup();
      group.add(radioButton1);
      group.add(radioButton2);
      group.add(radioButton3);

      panel.add(radioButton1);
      panel.add(radioButton2);
      panel.add(radioButton3);
      frame.getContentPane().add(panel, BorderLayout.CENTER);    
   }
}

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