动作侦听器是否应属于他们所申请的课程？

Question

I'm programming a web browser with multiple classes. One class is "navbar" which holds most of the buttons such as search, back, forward, etc. The navbar class has action listeners which, when the search button is pressed, become active, and lead to the production of a URL, which needs to be passed to the JEditorPane, but the editor pane is in a different class, "editor".

It does not make sense for an editor to be instantiated inside navbar, so how can i pass the variable from the navbar class to the editor class?

Is it okay to use statics in this situation?

Answer 1

Why not simply give the nav bar a reference to the editor? This could be done in the constructor, if the editor is instantiated first, or via getter/setter pair (actually, only the setter is really needed...). If the nav bar has such a reference, it can call the appropriate methods from within the listener implementation.

class Editor { ... }
class NavBar implements ActionListener
{
    public NavBar(Editor editor)
    {
        myEditor = editor;
    }
    public void actionPerformed (ActionEvent e)
    {
        // call methods of myEditor
    }

    private Editor myEditor;
}

Editor theEditor = new Editor();
NavBar theNavBar = new NavBar(theEditor);

Answer 2

You can use some kind of intermediate interface between these, typically a service like layer. Which is basically what the observer pattern is as well. The editor could list events the navbar produces, but that also means later on you could also catch these events in other components