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Experience with "language translators"?

I read several articles that mention converters from one language to another.

I am a little more skeptical about using such tools. Does anyone know or have experience talking about Visual Basic for Java or vs converters? Just one example to choose

http://www.tvobjects.com/products/products.html , claims to be a world leader or so in that regard. However, if you read this:

http://dev.mysql.com/tech-resources/articles/active-grid.html

There, the author claims:

"The consensus of MySQL users is that automatic conversion tools for MS Access do not work. For example, tools that translate existing Access applications to Java often lead to 80% complete solutions in which it takes longer to complete the last 20% of the work. than starting from scratch. "

We know that we need 80% of the time to implement the first 80% of the functionality and another 80% of the time for the other 20% ....

So has anyone tried such tools and found them useful?

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Usually they are best used for manually converting a section of code at a time where you view each piece of code. Often, in my experience, rewriting instead of conversion is the best option.

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