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See this thread for details.
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JDK - SDK - JRE what makes them different

 
Lee Grimes
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I am confussed about the difference between all these pakcages. I know JDK means java development kit, SDK is software development kit, JRE is java runtime enviroment. But me-o-my, how are they different and when do you use one over the other?
 
Jeanne Boyarsky
author & internet detective
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Eclipse IDE Java VI Editor
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Lee,
Welcome to JavaRanch!

The main difference is that the JRE does not come with a compiler. The JDK and SDK are essentially the same thing. Sun started calling it the SDK later on.
 
I agree. Here's the link: http://aspose.com/file-tools
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