Swing Java Tutorial

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  4. Getting and Setting the State of a JCheckbox Component
import javax.swing.JCheckBox;
public class Main {
  public static void main(String[] argv) throws Exception {
    JCheckBox checkbox = new JCheckBox();
    // Get the current state of the checkbox
    boolean b = checkbox.isSelected();
    // Set the state of the checkbox to off
    checkbox.setSelected(false);
    // Set the state of the checkbox to on
    checkbox.setSelected(true);
  }
}