What are public, private and protected in object oriented programming?

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They are access modifiers and help us implement Encapsulation (or information hiding). They tell the compiler which other classes should have access to the field or method being defined.

private – Only the current class will have access to the field or method.

protected – Only the current class and subclasses (and sometimes also same-package classes) of this class will have access to the field or method.

public – Any class can refer to the field or call the method.

This assumes these keywords are used as part of a field or method declaration within a class definition.

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