Java 中的按鈕組

Java 中的按鈕組與單選按鈕一起使用，以確保只選擇一個單選按鈕。單選按鈕和按鈕組都屬於 Java 的 Swing 庫。

本教程演示如何在 Java 中使用按鈕組。

Java 中的按鈕組

Button group 用於在 Java 中建立一組單選按鈕，要建立按鈕組，我們使用以下方法和建構函式。

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

讓我們嘗試一個具有多個單選按鈕的按鈕組示例。

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);

}

}

上面的程式碼在一個按鈕組中建立了一個帶有四個單選按鈕的面板。請參閱下面動畫中的輸出。

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