Revature Interview Test Study Questions and Answers 100% Verified Graded A
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Revature Interview
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Revature Interview
Object - An instance of a class
Class - Blueprint/prototype from which objects are created
Inheritance - subclasses can inherit states/behaviors of superclasses
interface - contract between class and outside world; when a class implements an interface, it promises to provide the behavior p...
[Document title] [Document subtitle] MUGWE [Date] [Course title] Revature Interview Test Study Questions and Answers 100% Verified 2024 -2025 Graded A Object - An instance of a class Class - Blueprint/prototype from which objects are created Inheritance - subclasses can inherit states/behaviors of superclasses interface - contract between class and outside world; when a class implements an interface, it promises to provide the behavior published by that interface package - a namespace for organizing classes & interfaces in a logical manner; makes large software projects easier to manage Encapsulation - Hiding the internal state of an object and requiring all interaction to be performed through an object's methods (accessors and mutators). Example: In a Bicycle class, method changeGear() could be implemented so as to only accept values between 1 and 6 Benefits of Objects - Modularity Information -Hiding Code re -use Pluggability and debugging ease Modularity - source code for an object can be written/maintained independently of source code for other objects. objects can be easily passed around the system once they've been created. Information -Hiding - By interacting only with object's methods, details of internal implementation stay secret from outside world. Code re -use - Complex objects only need to be coded once; you can use classes that have already been created by others. Pluggability/Debugging Ease - If an object is causing problems, you can easily remove it and put something else in its place. Example: replace a bolt that is broken, not the whole machine. How to use the changeGear() method on a Bicycle bike1? - bike1.changeGear(); How many superclasses can a subclass have? - ONLY ONE How many subclasses can inherit from the same superclass? - Infinitely many What is the main benefit of using inheritance? - The subclass contains all of the methods/fields of the superclass, but the subclass' code focuses on the unique aspects, making code simpler and easier to read. Why must the superclass' code be carefully documented? - Because that code is not physically in the subclass. Interface - the methods that a class is required to contain; empty methods that are related Should the methods in an interface be public or private? - MUST be public Packages - organizes a set of related classes/interfaces; like a folder on your computer class library - a set of packages API - Application Programming Language: Java's library of classes that you can use in your own applications. What do the Java API's packages represent? Give examples. - tasks for general purpose programming: String, File, Socket, some for developing GUIs. What is a benefit of using packages? - It allows developers to focus on the design of an application and NOT the technical stuff that makes it work. Real-world objects contain BLANK and BLANK. - State, behavior A software object's state is stored in BLANK - fields A software object's behavior is exposed through BLANK - methods (functions) Hiding internal data from the outside world, and accessing it only through publicly exposed methods is known as data BLANK - Encapsulation A blueprint for a software object is called a BLANK - class Common behavior can be defined in a BLANK and inherited into a BLANK using the BLANK keyword - superclass, subclass, extends A collection of methods with no implementation is called an BLANK - interface A namespace that organizes classes and interfaces by functionality is called a BLANK - package The term API stands for BLANK - Application Programming Interface Major Principles of Object -Oriented Programming - Encapsulation Abstraction Inheritance Polymorphism Accessor - method used to ask an object about itself Should an accessor be public or private? - must be public An accessor is any public method that gives information about the BLANK of an object. - state Mutator - public methods used to modify the state of an object while hiding the implementation of the method Benefits of Encapsulation - 1. You can make changes to a class without breaking other code using that class. 2. You can handle situations where the class is being used improperly in such a way that the code doesn't fail. Abstraction - development of classes/objects/types in terms of
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