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Java 中的按钮组与单选按钮一起使用，以确保只选择一个单选按钮。单选按钮和按钮组都属于 Java 的 Swing 库。

本教程演示如何在 Java 中使用按钮组。

Java 中的按钮组

Button group 用于在 Java 中创建一组单选按钮，要创建按钮组，我们使用以下方法和构造函数。

JRadioButton Radio_Button1 = new JRadioButton("Radio Button Group 1"); // Creates a new radio button

JRadioButton Radio_Button2 = new JRadioButton("Radio Button Group 2", true); // Creates a radio button which is already selected

ButtonGroup Button_Group = new ButtonGroup(); // Creates new button group

Button_Group.add(Radio_Button1); //Add radio button to the button group

让我们尝试一个具有多个单选按钮的按钮组示例。

package delftstack;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;

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

public class Button_Groups {
   public static void main(String[] args) {
       Create_Frame();
   }

   private static void Create_Frame() {
        JFrame Demo_Frame = new JFrame("Button Groups");
        Demo_Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        CreateBG(Demo_Frame);
        Demo_Frame.setSize(400, 200);
        Demo_Frame.setLocationRelativeTo(null);
        Demo_Frame.setVisible(true);
   }

   private static void CreateBG(final JFrame Demo_Frame){
        JPanel Demo_Panel = new JPanel();
        LayoutManager Panel_Layout = new FlowLayout();
        Demo_Panel.setLayout(Panel_Layout);

        JRadioButton Radio_Button1 = new JRadioButton("Radio Button Group 1");
        JRadioButton Radio_Button2 = new JRadioButton("Radio Button Group 2", true);
        JRadioButton Radio_Button3 = new JRadioButton("Radio Button Group 3");
        JRadioButton Radio_Button4 = new JRadioButton("Radio Button Group 4");

        ButtonGroup Button_Group = new ButtonGroup();
        Button_Group.add(Radio_Button1);
        Button_Group.add(Radio_Button2);
        Button_Group.add(Radio_Button3);
        Button_Group.add(Radio_Button4);

        Demo_Panel.add(Radio_Button1);
        Demo_Panel.add(Radio_Button2);
        Demo_Panel.add(Radio_Button3);
        Demo_Panel.add(Radio_Button4);
        Demo_Frame.getContentPane().add(Demo_Panel, BorderLayout.CENTER);
   }
}

上面的代码在一个按钮组中创建了一个带有四个单选按钮的面板。请参阅下面动画中的输出。