JCheckBox的類是一個實現一個複選框 - 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.JCheckBox類：

public class JCheckBox
   extends JToggleButton
      implements Accessible

字段域

以下是javax.swing.JCheckBox類字段域：

• static String BORDER_PAINTED_FLAT_CHANGED_PROPERTY -- 扁平屬性標識的變化。

類構造函數

S.N.	構造函數 & 描述
1	JCheckBox()  Creates an initially unselected check box button with no text, no icon.
2	JCheckBox(Action a)  Creates a check box where properties are taken from the Action supplied.
3	JCheckBox(Icon icon)  Creates an initially unselected check box with an icon.
4	JCheckBox(Icon icon, boolean selected)  Creates a check box with an icon and specifies whether or not it is initially selected.
5	JCheckBox(String text)  Creates an initially unselected check box with text.
6	JCheckBox(String text, boolean selected)  Creates a check box with text and specifies whether or not it is initially selected.
7	JCheckBox(String text, Icon icon)  Creates an initially unselected check box with the specified text and icon.
8	JCheckBox(String text, Icon icon, boolean selected)  Creates a check box with text and icon, and specifies whether or not it is initially selected.

類方法

S.N.	方法 & 描述
1	AccessibleContext getAccessibleContext()  Gets the AccessibleContext associated with this JCheckBox.
2	String getUIClassID()  Returns a string that specifies the name of the L&F class that renders this component.
3	boolean isBorderPaintedFlat()  Gets the value of the borderPaintedFlat property.
4	protected String paramString()  Returns a string representation of this JCheckBox.
5	void setBorderPaintedFlat(boolean b)  Sets the borderPaintedFlat property, which gives a hint to the look and feel as to the appearance of the check box border.
6	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

JCheckBox 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.showCheckBoxDemo();
   }

   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 showCheckBoxDemo(){

      headerLabel.setText("Control in action: CheckBox"); 

      final JCheckBox chkApple = new JCheckBox("Apple");
      final JCheckBox chkMango = new JCheckBox("Mango");
      final JCheckBox chkPeer = new JCheckBox("Peer");

      chkApple.setMnemonic(KeyEvent.VK_C);
      chkMango.setMnemonic(KeyEvent.VK_M);
      chkPeer.setMnemonic(KeyEvent.VK_P);

      chkApple.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {         
            statusLabel.setText("Apple Checkbox: " 
            + (e.getStateChange()==1?"checked":"unchecked"));
         }           
      });

      chkMango.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {             
            statusLabel.setText("Mango Checkbox: " 
            + (e.getStateChange()==1?"checked":"unchecked")); 
         }           
      });

      chkPeer.addItemListener(new ItemListener() {
         public void itemStateChanged(ItemEvent e) {             
            statusLabel.setText("Peer Checkbox: " 
            + (e.getStateChange()==1?"checked":"unchecked"));
         }           
      });

      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:/ > SWING 然後輸出以下命令。

D:SWING>javac comyiibaiguiSwingControlDemo.java

如果冇有錯誤出現，這意味著編譯成功。使用下麵的命令來運行程序。

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

驗證下麵的輸出