Computer Science / CS 0373 · Atom · ~20 seconds
Encapsulation
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State
Encapsulation makes a class's attributes and behaviors self-contained, traveling with the object through its lifetime, with internal implementation hidden from outside — enforced by scope rules and access modifiers.
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A fare card exposes tap-to-pay and hides everything about how the balance lives inside.
Watch for
The hiding is a promise to callers, not shyness.