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Revature Interview Study Guide: OOP Concepts, Beginning Java, SQL

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Revature Interview Study Guide: OOP Concepts, Beginning Java, SQL What Is an Object? - ✔✔a software bundle of related state and behavior. Often used to model the real-world _______ that you fin ... d in everyday life. What are Fields and Methods? - ✔✔An object stores its state in _______ and exposes its behavior through _______. What Is a Class? - ✔✔a blueprint or prototype from which objects are created. What Is Inheritance? - ✔✔provides a powerful and natural mechanism for organizing and structuring your software. allows classes to inherit commonly used state and behavior from other classes What Is an Interface? - ✔✔contract between a class and the outside world. When a class implements an ___________, it promises to provide the behavior published by that interface. A group of related methods with empty bodies What is a Package? - ✔✔a namespace for organizing classes and interfaces in a logical manner. Makes large software projects easier to manage. Think of them as files on your computer What is an API? - ✔✔Application Programming Interface. A package obtained from the huge class library offered by the Java platform. What is State and Behavior - ✔✔Real-world objects contain ___ and ___. What is Encapsulation - ✔✔Hiding internal data from the outside world, and accessing it only through publicly exposed methods is known as data ___. What is a Variable? - ✔✔a structure for temporarily storing data in your computer's memory. What is an Instance Variable? - ✔✔A variable declared after the class declaration, but outside of any methods. These variable can have different values for each separate instance of the class. What is a Class Variable? - ✔✔Whenever a variable has the keyword static attached to it. It means that every object of that class will share the same value for that variable. What is a Local Variable? - ✔✔When a variable is declared inside of a method. They do not exist outside of the method they are declared in. What is a Primitive Variable? - ✔✔Data types such as integers, decimals, and alphanumeric characters. EX: int x = 3; What is a Reference Variable? - ✔✔Stores memory addresses where objects are located, and dictate how those objects are accessed. EX: String myString = new String("Hello World"); What is an Array? - ✔✔a collection of primitive values or object references, stored in a single variable with an index. Has a fixed size and Data type What are all of the Access Modifiers? - ✔✔Public, Protected, Private, Default What is Method Overloading? - ✔ [Show More]

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