Re: Could you help on this reflection technique?

From:

Shawn <shaw@nospam.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 19 Sep 2006 09:01:09 -0400

Message-ID:

<eeopmn$73t$3@news.nems.noaa.gov>

Thank you for your feedbacks. OK, I don't want to use reflection. But I
really hate such coding(if .. else if .. else if ..):
     public void actionPerformed(ActionEvent e)
     {
         String actionCommand = e.getActionCommand();
         if (actionCommand.equals("save1"))
             memo1 = theText.getText();
         else if (actionCommand.equals("save2"))
             memo2 = theText.getText();
         else if (actionCommand.equals("clear"))
             theText.setText("");
         else if (actionCommand.equals("get1"))
             theText.setText(memo1);
         else if (actionCommand.equals("get2"))
             theText.setText(memo2);
         else if (actionCommand.equals("exit"))
             System.exit(0);
         else
             theText.setText("Error in memo interface");
     }

Every details is up and front, which is not wise. I hope to suppress
such details (or mess) into lower level so that the level I am working
on is clean. In some procedural language, if I have the procedures
defined before hand:

void save1()
{
....
}

void save2()
{
....
}

void get1()
{
....
}

Now I can do the following:

String actionCommand = e.getActionCommand();

do_it(actionCommand); //passing a procedure as a parameter into
another procedure, the appropriate procedure will be evoked.

For example, if I need to add another menu item or button called
"save3", I only need to take care adding the menu item into the gui menu
and provide the procedure "void save3(){ do what I want to do }". I
don't need to get into the mess (if .. else if .. else if ...).

I thought to use reflection to achieve the effect above. If not
recommended, what else approach can I think about? I am not clear about
how to use an interface Mapper here.

Thank you very much.