我需要注册mouseListener吗？

Question

I am supposed to have a GUI that keeps track of a list of pre-specified "special" points. If the user's mouse moves over one of these points, the point lights up. My task was to write the code that would go inside of the handler/listener below and use the references and also assume the existence of the method listed below (which I was supposed to invoke- assume it has already been written).

• specialPointList // an ArrayList of the pre-specified "special" points; the type is ArrayList<Point>
• assume this method exists: public void lightUpAPoint(Point p)

My code will go inside the handler method:

public void mouseMoved(MouseEvent event) {

}

Do I need to register my mouseListener?

This is what I believe the question is asking me to do:

public void mouseMoved(MouseEvent event) {
    specialPointList = ArrayList<Point>();

    Point mousePoint = event.getPoint(); 
    for(Point point : specialPointList) {
        if(mousePoint.equals(point)) {
            lightUpAPoint(point);
        }
    }
}

Answer 1

Whatever listener you create you need to register it to ui component. Look at methods of component. If there is method to add your listener you can do it.

All swing components support MouseListener.

When action is made by user new event is created and is sent to your listener.