After learning Data Hiding , Abstraction , and Encapsulation , let's explore a concept that frequently appears in Java interviews and certification exams: Tightly Encapsulated Class . At first glance, you might think a tightly encapsulated class is simply a class with private variables and public getters and setters. That's a common misconception. In Java, the definition is much simpler—and much stricter. There is only one rule you need to check. In this article, we'll under...