With this example we shall show you how to create JCheckBoxes in a Java Desktop Application. Checkboxes are very commonly used when we provide the user with a list of choices and we want him to pick as many as he wishes.
To create a Checked/Unchecked JCheckBox you have to:
- Create a number of
JCheckBoxes. - Use
setSelectedmethod to set a check box checked by default. Otherwise the check box will be unchecked. - Use
addmethod to add the checkboxes to the frame.
Let’s see the code snippet that follows:
package com.javacodegeeks.snippets.desktop;
import java.awt.FlowLayout;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
public class CreateCheckedUncheckedJCheckBox extends JFrame {
private static final long serialVersionUID = 1L;
public CreateCheckedUncheckedJCheckBox() {
// set flow layout for the frame
this.getContentPane().setLayout(new FlowLayout());
JCheckBox checkBox1 = new JCheckBox("Checkbox 1");
checkBox1.setSelected(true);
JCheckBox checkBox2 = new JCheckBox("Checkbox 2", true);
JCheckBox checkBox3 = new JCheckBox("Checkbox 3");
// add checkboxes to frame
add(checkBox1);
add(checkBox2);
add(checkBox3);
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new CreateCheckedUncheckedJCheckBox();
//Display the window.
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
This was an example on how to create Checked/Unchecked JCheckBoxes in Java.
