1) Find a web reference for object-oriented programming (OOP) software applications for mobile apps and write a short paragraph summarizing the contents. Please provide the web link. Also, try to show information that is relevant to you and that you can understand and explain.

2) The Java code attached adds and subtracts two numbers using linear programming. Please rewrite this code using OOP and provide your code. In this way, the code will have the same functionality but it will use OOP. Your code must be original, and it can be a modified version of a posted code; however, make sure you provide a reference to the student who wrote the original code. You can change the variable names and modify the logic in some way.