java.exe

we find "java.exe" in both bin and jre/bin folders .
what is the difference between both? are they same?

yes.

Probably the same.

i too belive they are the same.

java(class loader?) is duplicated, again probably, because you have the SDK, which is the build tools (javac, etc) and the JRE, which is just the tools to load a java program. Hmm...i think that makes sense! If you only had the JRE that only allows you to run java program and not compile them, then you would't have the ./bin directory.

The JRE is the runtime for running java compiled code.
The JDK in addition to containing the JRE contains tools for compiling the .java files to .class files.

Both java are the same.