Re: Accessing a class at runtime

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 21 May 2010 21:21:59 -0400

Message-ID:

<4bf731a9$0$273$14726298@news.sunsite.dk>

On 21-05-2010 10:16, BGB / cr88192 wrote:

"Lew"<noone@lewscanon.com> wrote in message
news:hsuiua$82f$1@news.albasani.net...

mike wrote:

On the command line I can execute the following:

java -jar eclipse.jar -application org.eclipse.StandAloneUpdate -
command list

I want to execute this from within a java [sic] program.
I have added the eclipse.jar in my java [sic] program so that I can
access
the StandAloneUpdate class.
How can I run execute the StandAloneUpdate class with the two commands
( -command list)?
Use reflection or use system call using ProcessBuilder? All ideas are
welcome.

Eric Sosman wrote:

Perhaps I've misunderstood your question, but what's wrong with

org.eclipse.StandAloneUpdate.main(
new String[] { "-command", "list" } );

?

or
org.eclipse.StandAloneUpdate.main( "-command", "list" );

invalid number of arguments for method 'main'.
cannot convert from String to String[].
main has no matching definition for (String, String).
?...

unless I am wrong ang someone does declare main as:
public static void main(String... args);

rather than:
public static void main(String[] args);

unless I have missed something here?...

Java since 1.5 allows both.

To quote the JLS:

<quote>
The method main must be declared public, static, and void. It must
accept a single argument that is an array of strings. This method can be
declared as either

public static void main(String[] args)

or

public static void main(String... args)
</quote>

Arne