Object Oriented System Design : Practice Questions and Answers

Inheritance is the most important "is a" (class structure) hierarchy and not "part of" (object structure) hierarchy.

Modular implementations are placed in file named with a .c suffix which are called header files. #include is necessary to tell the preprocessor where to look for header files if they are not placed in the current directory.

A call back is a programming idiom which a client provides a function to the server and the server calls the client's function whenever the appropriate conditions are met.

In Smalltalk and Simula, data and methods of manipulating the data are kept as a single unit called an object.

The object mode encompasses the principles of abstraction, encapsulation, modularity, typing, concurrency, and persistence which are the principles of object oriented programming language.

Polymorphism is a feature of object oriented programming that usually takes the ability of creating an object, or variable, or a function in more than one form. Polymorphism exists when the features of inheritance and dynamic binding interact.

Persistence deals with lifetime of data. Persistence saves the state and class of an object across time or space.

The memory address of a variable can be statically bound to the variable at compile time or dynamically at runtime. Likewise, variables in some languages have dynamic types that change during program execution, while other variables have static types that remain fixed over the execution of the program. Only the binding of the value determines whether the object is a variable or something else (such as constant).

The memory address of a variable can be statically bound to the variable at compile time or dynamically at runtime. Likewise, variables in some languages have dynamic types that change during program execution, while other variables have static types that remain fixed over the execution of the program. Only the binding of the value determines whether the object is a variable or something else (such as constant).

All the three types are the examples of Hierarchy, as it denotes ranking or ordering of abstractions.

Encapsulation focuses upon the implementation that gives rise to this behavior and is mostly often achieved through information hiding i.e., abstraction.

Entity abstraction, Action abstraction, Virtual machine abstraction, Coincidental abstraction

Abstraction focuses only on the outside view of an object and separates object's essential behavior from its implementation. It explains what an object does but doesn't explain how it does.

Object oriented programming follows a conceptual framework called object model and is implemented by writing classes and objects to make its style clear unlike procedure- oriented language.

The definition has two important parts. The former part uses the class and object abstractions to logically structure systems, and the latter uses algorithmic abstractions. The term object oriented design (OOD) is used to refer any method that leads to object oriented decomposition.

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Identifiers are used to name classes, methods and variables.

Semicolon is most commonly used in Java program, which terminates statements.

Documentation comment is used to produce an HTML file that documents the given program.

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