COnvert the programs in Java

Dear Contributors,
Help the readers by converting the programs from c++ to Java. It will help the readers those who have chosen Java instead of c++ for object oriented programming.
Cheers!
Happy Coding.

Start by inventorying the repository's C++ programs and checking whether Java equivalents or a program index already exist. The issue does not name files, a subset, tests, or a completion boundary; define the program list and expected Java organization before beginning, then verify that each selected C++ program has a corresponding Java version.

Written by the indexing model from the issue text.