Each problem has been placed in the specific package and in the same folder, there is the problem statement in pdf file for each problem. In the basic problem solving package/folder, there are multiple problems have been solved along preoblem statement in pdf file.
specific location of the source code in this java problem solving project: https://github.com/ManikHossain08/Java-Problem-Solving/tree/master/JAVA_Problem_Solving/src