Keynote address - data abstraction and hierarchy
OOPSLA '87 Addendum to the proceedings on Object-oriented programming systems, languages and applications (Addendum)
Object-oriented analysis and design with applications (2nd ed.)
Object-oriented analysis and design with applications (2nd ed.)
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Encapsulation is a technique used to isolate some of the design decisions made in writing a program. To encapsulate decisions, a program is organized into an interface, such as a set of procedures, and an internal part. All access to the program's services are available only through the interface. As a result, programs that use those services cannot reference variables internal to the program or arbitrarily transfer control to its internal part.