JCheckBoxes in Java Swing

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The JCheckBox class is the implementation of check boxes in Swing. The functionality is the same as the AWT, with the addition of icon labels.

Constructor methods use the following:

1. JCheckbox(String) A check box with the specified text label.
2. JCheckbox(String, boolean) A check box with the specified text label that is selected if the second argument is true.
3. JCheckbox(Icon) A check box with the specified icon label.
4. JCheckbox(Icon, boolean) A check box with the specified icon label that is selected if the second argument is true.
5. JCheckbox(String, Icon) A check box with the specified text label and icon label.
6. JCheckbox(String, Icon, boolean) A check box with the specified text label and icon label that is selected if the second argument is true.

The following table describes some of the methods provided by the JCheckbox class

Methods	Description
String getLabel() void setLabel(String)	Sets or gets a label for a check box
boolean getState() void setState(boolean)	Sets or gets the status of the check box

Example:

The following example creates two checkboxes one with a text and the other with a text and an icon displayed on it.

JCheckbox chk,chkIcon; ImageIcon img=new ImageIcon("Img001.gif"); chk=new JCheckbox("Check One"); chkIcon=new JCheckbox("Check Two",img);

Example:

The following example creates four checkboxes, of which one pair will have an icon. The others will have the traditional check box shown. By default the first and the last checkboxes are checked, while the others are not checked. The example uses a method called 'setSelectedIcon()' which is used to replace the previous gif with the gif passed as a parameter to the method.

For example in the following code, checkbox chkIconOne displays an icon 'Back_up.gif'. This icon represents a back arrow. When this checkbox is selected, the method setSelectedIcon() is used which sets 'Back_up.gif' to 'Back_sel.gif'. This represents that the check box is selected.

/* =========================================================== File Name : JCheckBoxesDemo.java WebSite : http://javaproglang.blogspot.in/ Facebook : https://www.facebook.com/AdvanceJavaProgramming Twitter ID : https://twitter.com/AdvanceJava Created By : Bintu Chaudhary =========================================================== */ import javax.swing.*; import java.awt.event.*; public class JCheckBoxesDemo extends JPanel { JCheckBox chkOne, chkTwo, chkIconOne, chkIconTwo; Icon imgIconBkUp, imgIconBkDis, imgIconBkSel; Icon imgIconFdUp, imgIconFdDis, imgIconFdSel; public JCheckBoxesDemo() { imgIconBkUp = new ImageIcon("Images/Back_up.gif"); imgIconBkSel = new ImageIcon("Images/Back_sel.gif"); imgIconFdUp = new ImageIcon("Images/Forw_up.gif"); imgIconFdSel = new ImageIcon("Images/Forw_sel.gif"); chkOne = new JCheckBox("Check One", true); chkTwo = new JCheckBox("Check Two", false); chkIconOne = new JCheckBox("Icon Check One", imgIconBkUp); chkIconTwo = new JCheckBox("Icon Check Two", imgIconFdUp, true); /* setSelectedIcon() method sets the 'Back_up.gif' to 'Back_sel.gif' when the object is selected */ chkIconOne.setSelectedIcon(imgIconBkSel); /* setSelectedIcon() method sets the 'Forw_up.gif' to 'Forw_sel.gif' when the object is selected */ chkIconTwo.setSelectedIcon(imgIconFdSel); // Add Checkboxes to the Panel. add(chkOne); add(chkTwo); add(chkIconOne); add(chkIconTwo); } public static void main(String[] args) { JCheckBoxesDemo myChk = new JCheckBoxesDemo(); // Calls the MyCheckBox constructor. JFrame frm = new JFrame("Check Box Demo"); // set the text on the frame frm.setContentPane(myChk); frm.setSize(300,200); // setSize() method is used specify the width and height of the frame frm.setVisible(true); // To display the Frame WindowListener listener = new WindowAdapter() { public void windowClosing(WindowEvent winEvt) { System.exit(0); } }; // End of WindowAdaptor() method frm.addWindowListener(listener); // Window listener activates the windowClosing() method } }

C:\>jdk1.4\bin>javac JCheckBoxesDemo.java
C:\>jdk1.4\bin>java JCheckBoxesDemo

"Output of JCheckBoxesDemo.class"

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Java Swing-1

JFrame	JPanel	JApplet
JButtons	JLabels	JTextFields
JPasswordField	JTextAreas	JCheckBoxes
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