Revature Interview Questions with Correct Answers
Object-oriented programming (OOP) Correct Answer-a programming
language model organized around objects that have data and methods
that form the object. It's an instance of a class. four main concepts:
1. Encapsulation
2. Abstraction
3. Inheritance
4. Polymorphism.
Variables Correct Answer-A structure for temporarily storing data in
your computers memory
1. primitive variables - data types like integers, decimals, and
alphanumeric characters
2. reference variables- store memory addresses where objects are
located. use a class (name) as their type and can only point to objects
that are instances of the class that is their type
Arrays Correct Answer-A collection of primitive values or object
reference organized with an index.
A specific amount of memory is reserved for an array based on the size
and data type
Instance variable Correct Answer-declared in the class scope
,{ } denote a change in scope
What is DBMS? Correct Answer-Database Management System
What is RDBMS? Correct Answer-Rational Database Management
System - stores data into tables with columns and rows
Ex. SQL Server
class Correct Answer-a blueprint or prototype from which objects are
created. a representation of a type of object. Example: class called
Vehicle describes the minimum things that a vehicle is.
Inheritance Correct Answer-Inheritance allows a class to use the
properties and methods of another class. Allows parent/child
relationship. Example: car and truck inherit functions of vehicle but car
is not truck or vice versa. A class inherits fields and methods from all its
superclasses, whether direct or indirect. A subclass can override methods
that it inherits, or it can hide fields or methods that it inherits.
Interface Correct Answer-a description of the actions that an object can
do. an Interface is a description of all functions that an object must have
in order to be an "X".
http://images.slideplayer.com/14/4328130/slides/slide_3.jpg
, Why use an interface? Correct Answer-main use is polymorphism, or the
ability to perform the same operation on a number of different objects.
Package Correct Answer-a namespace that organizes a set of related
classes and interfaces. Used to keep things organized by placing related
classes and interfaces into packages. Used in Java in order to prevent
naming conflicts.
How to create and use objects Correct Answer-You can declare,
instantiate using new keyword, or initialize by using new and calling
constructor
You can call object fields using the dot method and calling its functions
Encapsulation Correct Answer-the principle of information hiding and
wrapping code together into a single unit. data is not accessed directly
API Correct Answer-Application Programming Interface - Contains the
complete listing for all packages, interfaces, classes, fields, and methods
supplied by the Java SE platform
Association Correct Answer-a relationship between two classes. there is
no owner between objects. For example, a teacher *has-a* or *teaches*
a student. There is no ownership between the teacher and the student
Aggregation Correct Answer-a weak type of Association with partial
ownership. For an Aggregation relationship, we use the term *uses*. For
Object-oriented programming (OOP) Correct Answer-a programming
language model organized around objects that have data and methods
that form the object. It's an instance of a class. four main concepts:
1. Encapsulation
2. Abstraction
3. Inheritance
4. Polymorphism.
Variables Correct Answer-A structure for temporarily storing data in
your computers memory
1. primitive variables - data types like integers, decimals, and
alphanumeric characters
2. reference variables- store memory addresses where objects are
located. use a class (name) as their type and can only point to objects
that are instances of the class that is their type
Arrays Correct Answer-A collection of primitive values or object
reference organized with an index.
A specific amount of memory is reserved for an array based on the size
and data type
Instance variable Correct Answer-declared in the class scope
,{ } denote a change in scope
What is DBMS? Correct Answer-Database Management System
What is RDBMS? Correct Answer-Rational Database Management
System - stores data into tables with columns and rows
Ex. SQL Server
class Correct Answer-a blueprint or prototype from which objects are
created. a representation of a type of object. Example: class called
Vehicle describes the minimum things that a vehicle is.
Inheritance Correct Answer-Inheritance allows a class to use the
properties and methods of another class. Allows parent/child
relationship. Example: car and truck inherit functions of vehicle but car
is not truck or vice versa. A class inherits fields and methods from all its
superclasses, whether direct or indirect. A subclass can override methods
that it inherits, or it can hide fields or methods that it inherits.
Interface Correct Answer-a description of the actions that an object can
do. an Interface is a description of all functions that an object must have
in order to be an "X".
http://images.slideplayer.com/14/4328130/slides/slide_3.jpg
, Why use an interface? Correct Answer-main use is polymorphism, or the
ability to perform the same operation on a number of different objects.
Package Correct Answer-a namespace that organizes a set of related
classes and interfaces. Used to keep things organized by placing related
classes and interfaces into packages. Used in Java in order to prevent
naming conflicts.
How to create and use objects Correct Answer-You can declare,
instantiate using new keyword, or initialize by using new and calling
constructor
You can call object fields using the dot method and calling its functions
Encapsulation Correct Answer-the principle of information hiding and
wrapping code together into a single unit. data is not accessed directly
API Correct Answer-Application Programming Interface - Contains the
complete listing for all packages, interfaces, classes, fields, and methods
supplied by the Java SE platform
Association Correct Answer-a relationship between two classes. there is
no owner between objects. For example, a teacher *has-a* or *teaches*
a student. There is no ownership between the teacher and the student
Aggregation Correct Answer-a weak type of Association with partial
ownership. For an Aggregation relationship, we use the term *uses*. For
