AWT CheckBoxGroup類

介紹

checkboxgroup類用於分組組複選框。

類的聲明

以下是聲明爲java.awt.CheckboxGroup類：

public class CheckboxGroup extends Object implements Serializable

類的構造函數

S.N.

構造函數與說明

CheckboxGroup() ()
Creates a new instance of CheckboxGroup.

類方法

S.N.

方法和說明

Checkbox getCurrent()
Deprecated. As of JDK version 1.1, replaced by getSelectedCheckbox().

Checkbox getSelectedCheckbox()
Gets the current choice from this check box group.

void setCurrent(Checkbox box)
Deprecated. As of JDK version 1.1, replaced by setSelectedCheckbox(Checkbox).

void setSelectedCheckbox(Checkbox box)
Sets the currently selected check box in this group to be the specified check box.

String toString()
Returns a string representation of this check box group, including the value of its current selection.

繼承的方法

這個類繼承的方法從以下類：

java.lang.Object

checkboxgroup的實例

選擇使用編輯器創建以下java程序D:/ > AWT > com > yiibai.com > gui >

AwtControlDemo.java

package com.yiibai.gui; import java.awt.*; import java.awt.event.*; public class AwtControlDemo { private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; public AwtControlDemo(){ prepareGUI(); } public static void main(String[] args){ AwtControlDemo awtControlDemo = new AwtControlDemo(); awtControlDemo.showCheckBoxGroupDemo(); } private void prepareGUI(){ mainFrame = new Frame("Java AWT 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 Label(); headerLabel.setAlignment(Label.CENTER); statusLabel = new Label(); statusLabel.setAlignment(Label.CENTER); statusLabel.setSize(350,100); controlPanel = new Panel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showCheckBoxGroupDemo(){ headerLabel.setText("Control in action: CheckBoxGroup"); CheckboxGroup fruitGroup = new CheckboxGroup(); Checkbox chkApple = new Checkbox("Apple",fruitGroup,true); Checkbox chkMango = new Checkbox("Mango",fruitGroup,false); Checkbox chkPeer = new Checkbox("Peer",fruitGroup,false); statusLabel.setText("Apple Checkbox: checked"); chkApple.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Apple Checkbox: checked"); } }); chkMango.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Mango Checkbox: checked"); } }); chkPeer.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent e) { statusLabel.setText("Peer Checkbox: checked"); } }); controlPanel.add(chkApple); controlPanel.add(chkMango); controlPanel.add(chkPeer); mainFrame.setVisible(true); } }

編譯程序，使用命令提示符。到D:/ > AWT 然後鍵入以下命令。

D:AWT>javac comyiibaiguiAwtControlDemo.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:AWT>java com.yiibai.gui.AwtControlDemo

驗證下面的輸出

AWT