Swing JRadioButton

JRadioButton類是一個實現一個單選按鈕 - 可以選擇或取消選擇一個項目，其狀態顯示給用戶。

類聲明

以下是聲明 javax.swing.JRadioButton類：

public class JRadioButton extends JToggleButton implements Accessible

類構造函數

創建一個未選中的單選按鈕，使用指定的文本。

S.N.

構造函數 & 描述

1

JRadioButton()
Creates an initially unselected radio button with no set text.

2

JRadioButton(Action a)
Creates a radiobutton where properties are taken from the Action supplied.

3

JRadioButton(Icon icon)
Creates an initially unselected radio button with the specified image but no text.

4

JRadioButton(Icon icon, boolean selected)
Creates a radio button with the specified image and selection state, but no text.

5

JRadioButton(String text, boolean selected)
Creates a radio button with the specified text and selection state.

6

JRadioButton(String text, Icon icon)
Creates a radio button that has the specified text and image, and that is initially unselected.

7

JRadioButton(String text, Icon icon, boolean selected)
Creates a radio button that has the specified text, image, and selection state.

類方法

S.N.

方法 & 描述

1

AccessibleContext getAccessibleContext()
Gets the AccessibleContext associated with this JRadioButton.

2

String getUIClassID()
Returns the name of the L&F class that renders this component.

3

protected String paramString()
Returns a string representation of this JRadioButton.

4

void updateUI()
Resets the UI property to a value from the current look and feel.

方法繼承

這個類從以下類繼承的方法：

• javax.swing.AbstractButton

• javax.swing.JToggleButton

• javax.swing.JComponent

• java.awt.Container

• java.awt.Component

• java.lang.Object

JRadioButton 例子

選擇使用任何編輯器創建以下java程序在 D:/ > SWING > com > yiibai > gui >

SwingControlDemo.java

package com.yiibai.gui; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SwingControlDemo { private JFrame mainFrame; private JLabel headerLabel; private JLabel statusLabel; private JPanel controlPanel; public SwingControlDemo(){ prepareGUI(); } public static void main(String[] args){ SwingControlDemo swingControlDemo = new SwingControlDemo(); swingControlDemo.showRadioButtonDemo(); } private void prepareGUI(){ mainFrame = new JFrame("Java Swing Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); headerLabel = new JLabel("", JLabel.CENTER); statusLabel = new JLabel("",JLabel.CENTER); statusLabel.setSize(350,100); controlPanel = new JPanel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showRadioButtonDemo(){ headerLabel.setText("Control in action: RadioButton"); final JRadioButton radApple = new JRadioButton("Apple", true); final JRadioButton radMango = new JRadioButton("Mango"); final JRadioButton radPeer = new JRadioButton("Peer"); radApple.setMnemonic(KeyEvent.VK_C); radMango.setMnemonic(KeyEvent.VK_M); radPeer.setMnemonic(KeyEvent.VK_P); radApple.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Apple RadioButton: " + (e.getStateChange()==1?"checked":"unchecked")); } }); radMango.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Mango RadioButton: " + (e.getStateChange()==1?"checked":"unchecked")); } }); radPeer.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Peer RadioButton: " + (e.getStateChange()==1?"checked":"unchecked")); } }); //Group the radio buttons. ButtonGroup group = new ButtonGroup(); group.add(radApple); group.add(radMango); group.add(radPeer); controlPanel.add(radApple); controlPanel.add(radMango); controlPanel.add(radPeer); mainFrame.setVisible(true); } }

編譯程序，使用命令提示符。到 D:/ > SWING 然後輸出以下命令。

D:SWING>javac comyiibaiguiSwingControlDemo.java

如果沒有錯誤出現，這意味着編譯成功。使用下面的命令來運行程序。

D:SWING>java com.yiibai.gui.SwingControlDemo

驗證下面的輸出