Automate files input

Overview: I am creating automated assignment marking system, in which the goal is: suppose there are 100 students' assignments in a directory and if I start my program it should check all of the assignment.java one by one and generate a report based on that.

Clearer explanation of the question:
At the moment, I have got assignment.java of 1 student and my Testing.java (which creates an object of the class in assignment.java and generates a report based on the output of assignment.java). So, till now what I am able to achieve is: Inside the Test project (which contains Testing.java), I import assignment.java; run the Testing.java and generate the report. When it comes to second student, I remove previous assignment.java import new assignment2.java(second student); run the Testing.java, which uses the students program and generates the report.

What I want to achieve is, In my Testing.java instead of importing assignments one by one and marking them, I want to automate it. i.e. In my Testing.java, if I specify the path of the directory in which all assignments are placed, my system should automatically overwrite (import new assignment removing the older) assignment.java and generate a report based on that. :confused:

Any help would be greatly appreciated. :)

Thank you.

Code java:

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Files[] fileList =  new File(".").listFiles();
 
for(File f:fileList){
     // Process file
}

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Chris