Java AWT CheckboxGroup is a class that is used to create checkboxes and group a set of checkbox buttons together. Many components in the CheckboxGroup separate, which serves as a means to group a set of checkboxes. In this clause, we will delve into the CheckboxGroup class, and its methods, and demo its usage through a very simple example.
Class Declaration of CheckboxGroup
The CheckboxGroup class is declared as follows:
public class CheckboxGroup extends Object implements Serializable
Here, it extends the Object class and implements the Serializable interface.
Class Constructors
The CheckboxGroup class has a single constructor:
CheckboxGroup()
This constructor creates a new instance of CheckboxGroup.
Class Methods in Java AWT CheckboxGroup
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(Deprecated): As of JDK version 1.1, this method is deprecated and replaced by getSelectedCheckbox()
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Checkbox getSelectedCheckbox()
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(Deprecated): As of JDK version 1.1, this method is deprecated and replaced by setSelectedCheckbox(Checkbox)
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Sets the currently selected checkbox in this group to be the specified checkbox.
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Returns a string representation of this checkbox group, including the value of its current selection.
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Example of AWT CheckboxGroup with ItemListener
Java
// Java Program to implement AWT
// CheckboxGroup with ItemListener
import java.awt.*;
import java.awt.event.*;
// Driver Class
public class GeeksCheckboxGroupDemo {
// Components for the GUI
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
// Constructor to set up the GUI
public GeeksCheckboxGroupDemo() {
prepareGUI();
}
// Method to set up the basic structure of the GUI
private void prepareGUI() {
// Create the main frame
mainFrame = new Frame("GeeksforGeeks AWT Examples");
mainFrame.setSize(400, 400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent) {
System.exit(0);
}
});
// Create labels for header and status
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350, 100);
// Create a panel for controls
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
// Add components to the frame
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
// Method to show the CheckboxGroup demo
private void showCheckboxGroupDemo() {
// Set the header label
headerLabel.setText("Control in action: GeeksCheckboxGroup");
// Create a CheckboxGroup
CheckboxGroup categoryGroup = new CheckboxGroup();
// Create checkboxes with different names
Checkbox chkJava = new Checkbox("Java", categoryGroup, true);
Checkbox chkPython = new Checkbox("Python", categoryGroup, false);
Checkbox chkCSharp = new Checkbox("C#", categoryGroup, false);
// Add item listeners to each checkbox
chkJava.addItemListener(getCheckboxItemListener("Java"));
chkPython.addItemListener(getCheckboxItemListener("Python"));
chkCSharp.addItemListener(getCheckboxItemListener("C#"));
// Add checkboxes to the control panel
controlPanel.add(chkJava);
controlPanel.add(chkPython);
controlPanel.add(chkCSharp);
// Display the frame
mainFrame.setVisible(true);
}
// Method to create an ItemListener for a given category
private ItemListener getCheckboxItemListener(final String categoryName) {
// Return an ItemListener for the given category
return new ItemListener() {
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
statusLabel.setText(categoryName + " Checkbox: checked");
} else {
statusLabel.setText(categoryName + " Checkbox: unchecked");
}
}
};
}
// Main method to create an instance and show the demo
public static void main(String[] args) {
// Create an instance of GeeksCheckboxGroupDemo and show the demo
GeeksCheckboxGroupDemo checkboxGroupDemo = new GeeksCheckboxGroupDemo();
checkboxGroupDemo.showCheckboxGroupDemo();
}
}
Output:
that