in reply to Perl "with" Java
To expand on the comments from BioLion and moritz, learning different kinds of programming languages expand the number of techniques you have at your disposal, if you actually learn the other languages.
Different languages provide different tools, idioms, and approaches to solving problems. Even though you should be able to write any program in any language, some solutions are more natural in some languages. When you really learn a new language, and come back to Perl you will often find techniques that are available to you that may not have been obvious before. (Just learning to translate syntax is not enough.)
I also think that the more different the languages you learn, the larger the benefit you gain. Java has a very different view of the world than Perl does. This different viewpoint can help your later programming by reducing the tendency to applying one solution to every problem.
Probably the biggest benefit of learning multiple programming languages is increasing the approaches you can consider.
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