Online judges are systems designed for the reliable evaluation of algorithm source code submitted by users, which is next compiled and tested in a homogeneous environment. Online judges are becoming popular in various applications. Thus, we would like to review the state of the art for these systems. We classify them according to their principal objectives into systems supporting organization of competitive programming contests, enhancing education and recruitment processes, facilitating the solving of data mining challenges, online compilers and development platforms integrated as components of other custom systems. Moreover, we introduce a formal definition of an online judge system and summarize the common evaluation methodology supported by such systems. We will create an online judge for low level design, that can test multiple classes in one time and also check the code quality and we will also add visual representation of output for multiple input. We will check security of all classes. Main aim of the project is that student / user can test his/her low level design code quality, and the compiler will report errors/bugs if code has any
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