Re: Cannot clean up Evaluator.java code - errors involving javax.tools.*

From:
"phillip.s.powell@gmail.com" <phillip.s.powell@gmail.com>
Newsgroups:
comp.lang.java.help
Date:
24 Jan 2007 12:25:36 -0800
Message-ID:
<1169670336.404202.301430@j27g2000cwj.googlegroups.com>
On Jan 24, 9:46 am, Wojtek Bok <w...@nospam.com> wrote:

phillip.s.pow...@gmail.com wrote:

It does, and it doesn't. Once again I am going to illustrate how my
"language" and your "language" are so not related.That is like saying that the following is a great hindrance to my programming:


20 GOSUB 50:GOTO 100

How can I do things when the language does not have line numbers?

 I need to do in
Java what can easily be done in PHP like this:

$msg = eval('JButton ' . $buttonNameValArray[$i][0] . ' = new
JButton("' . $buttonNameValArray[$i][1] . '");');So you are trying to instantiate a new JButton with a variable name which is in an array.


OK, what defines the array? Is it hard coded, is it read in from a configuration file, does the user enter the name?

Use a HashMap:

HashMap<String,JButton> buttons = new HashMap<String,JButton>();


Thank you! It got me on the right track and off the "eval()" track:

 private Map<String, JButton> map;

 /**
     * Generate the necessary {@link javax.swing.JButton} matrix
     * @throws java.io.FileNotFoundException Thrown if the CSV file
supplying button definition is not found
     * @throws java.io.IOException Thrown if an I/O error occurs while
obtaining CSV file
     * @throws java.lang.Exception Thrown if any other error occurs
     * @see com.csvreader.CsvReader
     */
    public void generateButtons() throws FileNotFoundException,
IOException, Exception {
        CsvReader reader = new CsvReader(IconMakerGlobals.srcPath +
                File.separator +
                getClass().getName().toLowerCase() +
                "buttonnamesvalues.csv");
        reader.readHeaders();

        while (reader.readRecord())
            map.put(reader.get("buttonName"), new
JButton(reader.get("buttonVal")));

    }

 private void initComponents() {
        map = new LinkedHashMap<String, JButton>();
 try {
            generateButtons();
            ActionListener listener = new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    applyCalculatorRules(evt.getActionCommand());
                }
            };
            for (Map.Entry<String, JButton> e : map.entrySet()) {
                e.getValue().addActionListener(listener);
                e.getValue().registerKeyboardAction(listener,
                        KeyStroke.getKeyStroke(KeyEvent.VK_M, 0, true),
                        JComponent.WHEN_IN_FOCUSED_WINDOW);
                e.getValue().setSelected(false);
                p.add(e.getValue());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
}

Then somewhere else:

buttons.add(buttonNameValArray[i][0],new JButton(buttonNameValArray[i][1]));

Then somewhere else you can retrieve the JButton to use it:

buttons.get(buttonNameValArray[i][0]);

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