Java 中的按钮组

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.JFrame;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

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。

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