These Object Oriented Programming (OOP) multiple-choice questions and their answers will help you strengthen your grip on the subject of Object Oriented Programming (OOP). You can prepare for an upcoming exam or job interview with these 90+ Object Oriented Programming (OOP) MCQs.
So scroll down and start answering.
A. Base
B. Child
C. Derived
D. Extends
A. Derived, two or more
B. Base; two or more
C. Derived; one
D. Base; one
A. Composition
B. Extension
C. Is-a
D. Scope
A. Base, derived
B. Derived, derived
C. Derived, base
D. Base, base
A. Private members
B. Base class members
C. Public members
D. All of the above
A. Public
B. Private
C. Protected
D. All of the above
A. Data type
B. Data field
C. Argument
D. Class
A. ImageIcon
B. Icon
C. ImageLabel
D. None of the above
A. Work
B. Public
C. Private
D. Set
A. Inheritance
B. Encapsulation
C. An Object
D. Raw type
A. Command line
B. Focus
C. Request link
D. Lifeline
A. OON
B. OOD
C. UML
D. OOP
A. Method
B. Property
C. Parameter
D. Operator
A. Any method
B. Method overloading
C. Method overriding
D. Compiling
A. The number of people in each house in a small neighborhood
B. The lot size for each house in a small neighborhood
C. The color of each house in a small neighborhood
D. The weather conditions for each house in a small neighborhood
A. To avoid redundant coding in children
B. To explore a hypothetical class
C. To prevent unwanted method implementation
D. To reserve memory for an unspecified class type
A. Only when you export
B. Both at compile time and runtime
C. At compile time
D. At runtime
A. It will result in code that is more extensible and maintainable
B. It will result in a more compact product.
C. It will speed initial development.
D. It will allow you to add that design pattern to your resume.
A. Defining classes by focusing on what is important for a purpose
B. Hiding the data and implementation details within a class
C. Making all methods private
D. Using words to define classes
A. It implies encapsulation.
B. A superclass object has an IS-A relationship with its subclass.
C. It implies a virtual method.
D. A subclass object has an IS-A relationship with its superclass or interface
A. An abstract method
B. A public internal method
C. An internal method
D. A protected internal method
A. Employee currentEmployee = Employee.Create();
B. Employee currentEmployee = new Employee();
C. Employee currentEmployee;
D. Employee currentEmployee = Employee.New();
A. Default
B. Copy
C. Parameterized
D. Constructors do not have a return type
A. When an object is created from a class using the new keyword
B. When an class is defined using the class keyword
C. Every time an object is referenced
D. When an object is created from a class using the create keyword
A. The object can be accessed, declared, and used locally in that function.
B. The object must be declared inside any other function.
C. The object is temporarily accessible outside the function.
D. The object can call all the other class members anywhere in the program.
A. Do and check
B. Catching and trying
C. Try and catch
D. Do and while
A. It makes it easier to save the entity.
B. All of these answers
C. It can make the entity retrieval more efficient
D. It minimizes coupling.
A. Inheritance describes the ability to create new classes based on an existing class.
B. Inheritance means that a group of related properties, methods, and other members are treated as a single unit or object.
C. Inheritance forces a class to have a single responsibility from only one parent.
D. Inheritance means that you will never have multiple classes that can be used interchangeably, even though each class implements the same properties or methods in different ways.
A. Multilevel
B. Hierarchical and multiple
C. Hierarchical
D. Multiple
A. A default parameter's constructor is not equivalent to the default constructor
B. A default constructor is inherited from a parent class
C. A default constructor can be called explicitly
D. A default constructor cannot be defined by the coder
A. Getters and setters can speed up compilation.
B. Getters and setters provide encapsulation of behavior.
C. Getters and setters provide a debugging point for when a property changes at runtime.
D. Getters and setters permit different access levels.
A. Association is a relationship where all objects have their own life cycle and there is no owner.
B. Association is the process where model elements cooperate to provide higher-level behavior.
C. Association is whole/part relationship where one object is composed of one or more other objects, each of which is considered a part of the whole.
D. Association is where all objects have their own life cycle, but there is ownerhip, and child objects can not belong to another parent object.
A. User Stories are shorter and less detailed.
B. User stories are more accurate.
C. User stories are more detailed and structured.
D. User storised are more anecdotal and personal.
A. Multiple
B. Any type of inheritance
C. Multilevel
D. Hierarchical
A. An object-based language
B. A class-based language
C. A procedure-oriented language
D. If classes are supported, polymorphism will be supported
A. Abstraction is using a private access specifier for the data members.
B. Abstraction is using public member functions to access and manipulate the data members.
C. Abstraction is using the class concept with both data members and member functions.
D. There is insufficient information to decide where abstraction is being used.
A. Observer, State, Strategy, Template Method, and Visitor.
B. Composite, Visitor, State, Prototype, and Singleton.
C. Composite, Builder, Factory Method, Prototype, and Singleton.
D. Abstract Factory, Builder, Factory Method, Prototype, and Singleton.
A. One class only
B. Two classes
C. As many classes as required
D. At least two classes
A. To the main object of the caller function, too
B. On the caller function object and also the called function object
C. On the copy of the object that is made during the pass
D. Only in the local scope of the called function
A. A set of instructions designed to perform a frequently used operation within a program and return no values
B. The exact same thing as a function and subroutine
C. A set of variables that can change over time
D. A procedure associated with data and behaviour
A. Camera
B. Display
C. Motherboard
D. Mobile phone
A. The class at the third level
B. The class at the first level
C. All have the same degree of abstraction.
D. The class at the second level
A. Multilevel inheritance
B. Double inheritance
C. Single inheritance
D. Hierarchical inheritance
A. The duplication uses unnecessary space.
B. One has to maintain all the duplicates.
C. Duplication can cause intellectual property concerns.
D. Duplication is easy to hide.
A. It is called initially when an object is created and called with every new object instance.
B. It is called when an object is destroyed and only one time.
C. It is called initially when an object is created and only one time.
D. It is created at time when the object is discarded.
A. To initialize all the members with static value
B. To delete the static members when not required
C. To initialize the static members of class
D. To clear all the static members' initialized values
A. Code Responsibility Collection cards are a brainstorming tool used in the design of procedural software
B. Class Responsibility collaboration cards are a brainstorming tool used in the design of oop software
C. Code Responsibility Correction cards are tools used for debugging
D. Code Responsibility Correction cards are tools for modeling
A. If one element of an aggregation is dereferenced, all its elements are eligible for garbage collection
B. If a composition dies, the contents die
C. The contents of a composition are all siblings
D. An aggregation contains only abstract classes
A. If one element of an aggregation is dereferenced, all its elements are eligible for garbage collection
B. If a composition dies, the contents die
C. The contents of a composition are all siblings
D. An aggregation contains only abstract classes
A. It can increase code vulnerability
B. It can make code unsafe
C. It can limit code readability
D. It can be safer for coding