Question

explain java dex .......​

Answer 1

Answer:

One of the most remarkable features of the Dalvik Virtual Machine (the workhorse under the Android system) is that it does not use Java byte code. Instead, a homegrown format called DEX was introduced and not even the byte code instructions are the same as Java byte code instructions.  

Android programs are compiled into dex (Dalvik Executable) files, which are in turn zipped into a single apk file on the device dex files can be created by automatically translating compiled applications written in the Java programming language.