JToggleButton jtb = new JToggleButton("Press Me");
jtb.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent ev) {
if(ev.getStateChange()==ItemEvent.SELECTED){
System.out.println("button is selected");
} else if(ev.getStateChange()==ItemEvent.DESELECTED){
System.out.println("button is not selected");
}
}
});