How do I know which version of Java I use Perl?

Question

How do I find out in which version of Java I use Perl programming and using this jar file based on this?

Answer 1

in perl script,

@args = ("java", "-version");
system(@args) == 0
    or die "system @args failed: $?"

or rather just

system("java -version");

Answer 2

You can grab a Java version with a Perl script using backlinks.

$version = `java -version`;

Also see: How can I grab STDERR from an external command? for more alternatives than you can shake a stick.

Answer 3

"java -version" , .

"perl -v" Perl, .

Answer 4

use IO::Handle;

open OUTPUT, '>', "output.txt" or die $!;
STDERR->fdopen( \*OUTPUT, 'w' ) or die $!;

print `java -version`;

Answer 5

System...

system("java -version");

If you are going to export new Java

system('export PATH=/usr/java1.6/bin:$PATH');