importing project in Eclipse

Hello I am new to Eclipse (and I am a novice in Java): I am creating a project which should make use of some classes from another project. Do I have to export necessarily this last project as JAR file and add in my projec开发者_运维技巧t? Are there other alternatives?

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There are several alternatives:

• If project A depends on project B, and both projects are in the same Eclipse workspace, you can just project B to project A's build path (project properties / build path / project). This has the nice advantage that it will (optionally) automatically pull in project B's JARs, plus updates to B will be used automatically by A, and you can debug into B's code (even using hot code replace).
• If A and B are fairly separate, just make B into a JAR (or several ones), then add these to A's build path.

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1. If you have the source of those class files you can just link that source
2. Or add the other project as a dependent project.
3. Or create a jar of those classes and add that in lib.