向面板添加多个鼠标监听器

Question

I'm trying to add more than one mouse listener to a panel, but I want them to be on the same line like this:

Paint.paint.addMouseListener(Shape.circle,Shape.blah);

Is that possible? I know you can do it like this instead:

Paint.paint.addMouseListener(Shape.circle);
Paint.paint.addMouseListener(Shape.blah);

And that's not too bad, but I thought it would be easier if you're not using arrays, and you can add it to the same line if it's possible. So, anyone know if this is possible? Thanks.

Answer 1

There is no addMouseListener(...) method that accepts more than one listener, but you can write your own utility method to do so:

public static void addManyMouseListeners( Component component, MouseListener... mouseListeners ) {

    if ( component != null && mouseListeners != null ) {
        for ( MouseListener mouseListener : mouseListeners ) {
            component.addMouseListener( mouseListener );
        }
    }
}

The varargs parameter allows you to call the method like:

addManyMouseListeners( Paint.paint, Shape.circle, Shape.blah );

And in fact add as many mouse listeners as you like. Inside the method, the varargs parameter is interpreted as an array, and you iterate on it as you would on any array.