How to find out the programming language in which the application is written?

Question

Android

I understand that almost all applications are written in java. But even this does not prevent writing an application in html 5, so it became interesting about this, can you somehow find out in which particular programming language this or that application is written?

Answer 1

Either I did not understand anything, or you asked some kind of nonsense ...

Answer 2

In principle, if there is experience, then the code is already recognizable by syntax. Well, this is if popular languages.
In general, there is a utility
https://ru.m.wikipedia.org/wiki/PEiD
which determines the compiler (and, accordingly, the language) of the file.
PS

I understand that almost all applications are written in java. But even this does not prevent writing an application in html 5

Did you understand what you wrote?