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import javax.swing.JCheckBox;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

/*
 * @test
 * @bug 4277049
 * @summary Tests that ToggleButtonModel doesn't fire extra ChangeEvents
 */

public class bug4277049 implements ItemListener {

    public static void main(String[] args) throws Exception {
        JCheckBox box = new JCheckBox();
        box.setSelected(false);
        box.addItemListener(e -> fail());
        box.setSelected(false);

        if (failed()) {
            throw new RuntimeException("Failed: extra ChangeEvent was fired");
        }
    }

    private static boolean failed_flag = false;
    synchronized static void fail() {
        failed_flag = true;
    }
    synchronized static boolean failed() { return failed_flag; }

    @Override
    public void itemStateChanged(ItemEvent e) {
    }
}