Re: How to initialise a final static String array

From:
Lew <noone@lewscanon.com>
Newsgroups:
comp.lang.java.gui
Date:
Sun, 18 Mar 2012 10:28:13 -0700
Message-ID:
<jk55vc$2f4$1@news.albasani.net>
Cecil Westerhof wrote:

I want to use final for my static variables. I now do for example:
    private static final Connection conn;

DO NOT USE TAB CHARACTERS TO INDENT USENET POSTS.

Use spaces, up to four per indent level.

     private static final Combo container;

and
    static {
        Connection tempConn;
        Statement tempStmt;
        try {
            Class.forName("org.h2.Driver");
            tempConn = DriverManager.getConnection(
                    "jdbc:h2:tcp://localhost/~/databases/stock", "sa", "");
            tempStmt = tempConn.createStatement();
        } catch (Exception e) {
            tempConn = null;
            tempStmt = null;
        }
        conn = tempConn;
        stmt = tempStmt;

Static JDBC connections, and especially static JDBC statements, are a very bad
idea.

Very bad.

Statements should be local in scope, not even instance level. (Usually.) Even
connections should only be instance members if you have rather short-lived
objects holding them.

and
        if (conn == null) {
            throw new Exception("Could not initialise");

What kind of exception /should/ you throw? Not 'Exception'.

         }

The only problem I have is with my array of String.
I now have:
    private static final String[] titles = {
        "Stock",
        "Number",
        "Dare",
        "Container"
    };

Because when I put it in the static block I get an error.


That doesn't make sense. It's a perfectly legitimate initialization.

Beside this I can execute a statement like:
        titles[0] = "changed";

Can I get the initialisation in the static part? And in such a way
that the elements can not be changed?


First tell us what you did that didn't work.

http://sscce.org/

--
Lew
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