oop-encapsulation

Encapsulation restricts access to object internals by declaring fields private and exposing controlled public methods. Use private fields with public getter and setter methods to enforce validation rules and maintain invariants, reducing coupling between classes.

Setter validation ensures objects maintain valid state by checking constraints before mutations occur. This defensive approach prevents invalid data from corrupting internal state and simplifies debugging by catching errors at the boundary.

Yes. Each language supports encapsulation through access modifiers and property controls: Java uses private/public keywords, Python uses naming conventions and properties, TypeScript uses private keyword and getters/setters to enforce information hiding consistently.

Information hiding is the principle of restricting access to internals; encapsulation is the mechanism implementing it through private fields and public interfaces. Encapsulation applies information hiding to reduce coupling and improve maintainability.

Implement mutators with validation logic that checks preconditions before applying state changes. Use invariant preservation patterns in setters to reject modifications violating business rules, ensuring objects remain in predictable, valid states.

No. Expose only fields that clients legitimately need to access or modify. Keep implementation details private and provide minimal public interfaces; this reduces surface area, maintains flexibility to refactor internals, and enforces clearer contracts.