This simple example shows you how to get or set the state of a `JCheckBox`. The method to set the state is `JCheckBox.setSelected(boolean)` and the method for getting the state is `JCheckBox.isSelected()` which return a boolean value.

“`java
package org.kodejava.swing;

import javax.swing.*;
import java.awt.*;

public class CheckBoxState extends JFrame {
public CheckBoxState() throws HeadlessException {
initialize();
}

private void initialize() {
setSize(500, 500);
setTitle("JCheckBox Demo");
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setLayout(new FlowLayout(FlowLayout.LEFT));

// Creating checkbox with text label
JCheckBox checkBox = new JCheckBox("Check me!");
checkBox.setSelected(true);

// Get checkbox selection state
boolean selected = checkBox.isSelected();
if (selected) {
System.out.println("Check box state is selected.");
} else {
System.out.println("Check box state is not selected.");
}

getContentPane().add(checkBox);
}

public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new CheckBoxState().setVisible(true));
}
}
“`