Programming Principles in Object Oriented System Design : Practice MCQ Questions & Answers with Explanations

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Use of Hierarchical classification avoids defining the properties of object explicitly at each level which have acquired their properties from higher levels.

'Inheritance' is the mechanism provided by Object Oriented Language, which helps an object to acquire the properties of another object usually child object from parent object.

Each method or variable in a class may be marked 'public' or 'private'. They are called Access Specifiers.

Encapsulation is the mechanism that binds together code and data it manipulates, and keeps both safe from outside interface and misuse. Class, which contains data members and methods is used to implement Encapsulation.

'Encapsulation' acts as protective wrapper that prevents code and data from being accessed by other code defined outside the wrapper.

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An essential element of Object Oriented Programming is 'Data Abstraction' which means hiding things. Complexity is managed through abstraction.