The Problem Many developers (like myself) who started their careers with OOP (Java, C#, ...) during the last decades will look at this code and find nothing wrong about it at first sight. public class Person { private String name; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } In fact, everything's wrong with this code fragment. However, we have ...