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This lesson covers encapsulation -- one of the four pillars of Object-Oriented Programming -- and the use of access modifiers to control visibility of class members. This is a core topic in the OCR A-Level Computer Science (H446) specification.
Encapsulation is the principle of bundling data (attributes) and the methods that operate on that data into a single unit (a class), while restricting direct access to the object's internal state. External code interacts with the object only through its public interface (methods), not by directly reading or modifying its attributes.
| Benefit | Explanation |
|---|---|
| Data protection | Private attributes cannot be accidentally modified by external code. |
| Controlled access | Getters and setters allow validation before data is read or changed. |
| Reduced coupling | External code depends on the public interface, not the internal implementation. |
| Easier maintenance | Internal implementation can change without affecting code that uses the class. |
| Easier debugging | Bugs related to data can be traced to the class itself. |
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