Creating CheckBoxes in an Applet Window using Advanced Java Programming

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The Checkbox are used where there are multiple options for a user and a user have a option to Select any Options either he may choose only a Single Option or either he may select all options. The check boxes have two states selected or un-selected or true and false or on and off, etc. There are two Types of Checkboxes in Java.

1. Non exclusive- in this we can select a series of check boxes.
2. Exclusive – in this we can select only one form a given Series of Options of from Checkboxes. It behaves like a Radio or option Button.
For creating check Box.

1. Checkbox() create empty.
2. Checkbox(String) with a string
3. Checkbox(String,Boolean) This will first creates a check box with text string and then it specifies whether it is selected or unselected.
4. Checkbox(String, Boolean, null ) the null is used for specifying whether it is part of a checkbox group or no CheckboxGroup used to Create Option Buttons from the Checkboxes and Third Argument of Checkbox will determine whether a Checkbox is a Part of Option Buttons because JAVA doesn't provide a Separate Method For Creating an Option or Radio Buttons. For Creating a Option Button we have to use CheckboxGroup and then Specify the name of CheckboxGroup while Creating a Checkbox as like this.

CheckboxGroup cg=new CheckboxGroup();
CheckBox c=new CheckBox("City", True, cg);

The following example displays checkboxes on the applet using the Checkbox class.
/* =========================================================== File Name : CheckboxTest.java WebSite : http://javaproglang.blogspot.in/ Facebook : https://www.facebook.com/AdvanceJavaProgramming Created By : Bintu Chaudhary =========================================================== */ import java.awt.*; import java.applet.*; /* <APPLET Code="CheckboxTest" Width=500 Height=200> </APPLET> */ public class CheckboxTest extends Applet { public void init( ) { /*The statement creates an object and adds the checkbox on the applet.*/ Checkbox chkShoes,chkSocks,chkShirt; chkShoes = new Checkbox("Shoes"); chkSocks = new Checkbox("Socks", true); //This checkbox is checked chkShirt = new Checkbox("Shirt"); add(chkShoes); add(chkSocks); add(chkShirt); } }
The above code will be stored in the file called ButtonTest.java, which on compilation will crate a class file called Button.class. Now compiple this file using below commands in the DOS mode:

C:\>jdk1.4\bin>javac CheckBoxTest.java
C:\>jdk1.4\bin>appletviewer CheckBoxTest.java

"Output of CheckBoxTest.java"

Download Complete Program   -

Methods of the Button Object:

Methods	Action
getLabel()	used for Retrieving the text of Checkbox.
setLabel(String)	Used to Specify the Text of Checkbox.
getState()	Check whether a Checkbox is Selected or Not.
setState(Boolean)	Used to set the State either True or false.

AWT Controls

Label	Buttons	Check Boxes	Radio Buttons
Choice Controls	TextFields & Password	TextAreas	Scrolling Lists	Scrollbars