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I need to compile a project for Java 6 to use with java 6 or 7 (I can't upgrade all of the computers in my life). I've been searching all over and found somewhat helpful stuff, but I'm rather new to java - I don't understand much of how to use the presented alternatives (ant-build, Maven, javac).

My program does not use any API methods that are not available in Java 6, but it does use the API of another external .JAR (it is a basic plugin for an example program)

Is there a simple way to do this with Eclipse's Export function, or do I need to use some other program/method?

If I need to use something other than Eclipse, how would I best go about doing it for a multi-class, multi-package file dependent on another external .jar's API?

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Right-click on your project in eclipse and open the project properties.

Then navigate to Java compiler and set the compliance level to 1.6.

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That should do it.

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Thanks so much to both of you! I feel stupid for not realizing something so simple, but I couldn't find it anywhere >.<
Aah, accepted. I had tried to upvote, but I don't have 15 rep.
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In Eclipse Juno SR1: right click your project -> Properties -> Java Compiler -> Compiler compliance level.

Set that to 1.6 and you're done. You might need to enable project specific settings and disable compliance with execution environment - 2 checkboxes in the same window.

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