Is there en API or something that tell me if a code is correct?

Question

Is there an API or something that I could implement in a website to correct java code, like eclipse’s compiler or something like that.
What I need to do is correct exercise for students.

Answer 1

Simple
See compiler error she told everthing about error

Answer 2

A code can't know what you want to do, unless you code it to know that, so no. The best I can advise you to do is print as much data as you can in your program to verify it is the same as your assignment.

Answer 3

You can write your own module which checks errors and correct them