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what is difference between JDK and JRE

 
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in jre , bin folder is available where all exe files are stored. then why jdk?
 
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JRE has everything you need to run your java application. But lacks the development tools as the compilers and things like that.

The JDK is focused in development, it includes everything you need to run your application, but also it includes development tools as compilers.

Usually as a developer you work with a JDK and your clients will use a JRE make use of your application.
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