[JAVA]如何调用方法“itemStateChanged”

So, I have this method;

所以，我有这种方法;

public void itemStateChanged(ItemEvent event){
        if(event.getSource() == temasJogo){
            if(event.getStateChange() == ItemEvent.SELECTED){
                indiceTema = indiceTemas[ temasJogo.getSelectedIndex() ];
            }

        }
    }
public v