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Why JDK has JRE

 
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Hi

After installation of java,we have 2 folders JDK & JRE under installation directory. Also there is JRE folder inside JDK folder. What is the difference between this inner JRE and Outer JRE??

Thank You.
 
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the JDK's JRE has server version of virtual machine called HotSpot(VM which has JIT compiler) addition to client VM. the outer JRE contains only client version of VM.
coming to your question: I think it makes sense to put jre into developer kit, so that everything will be under one place. also you can switch between server and client version of JRE at runtime to produce better code.
 
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