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JDK - SDK - JRE what makes them different

Lee Grimes

Joined: Dec 25, 2004
Posts: 3
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
internet detective

Joined: May 26, 2003
Posts: 30116

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.

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