Part 4 - Tightly Encapsulated Class in Java

Short summary

A beginner-level Java tutorial explaining that a tightly encapsulated class is defined by one rule only: every instance variable must be declared private. Getters, setters, constructors, and method visibility are irrelevant to the definition. Covers inheritance traps where a non-encapsulated parent class prevents any child from being tightly encapsulated, with multiple code examples.

• •A class is tightly encapsulated if and only if every instance variable is private—nothing else matters
• •Getters, setters, and constructors are irrelevant to the definition
• •If a parent class is not tightly encapsulated, no child class can be either

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