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between j2sdk and jre

 
Greenhorn
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can anyone let me know the difference between j2sdk and

jre

.
in the given web address you can see that the writer has taken j2sdk but not

jre

why?
http://roseindia.net/ejb/ejbtutorial/building_a_simple_ejb_application.shtml
 
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http://www.java.com/en/download/faq/jre_jdk.xml
 
Sheriff
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The answer is in the JavaBeginnersFaq.
 
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JRE is java runtime environment. Any computer user can have this installed, you don't need to be a developer to use this. For example if you want to play a game somewhere on the internet written in java, you will need JRE installed.

SDK is the development kit. You need this installed in order to be able to develop java programs.
 
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