Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
Whats the point of Private Constructors |
You don't want an object to be created. Either implementing a singleton or the class contains only static methods which can be called without the class name. |
|
|
Object vs. Class |
-Object is an instance of a class. -Objects have a lifespace classes do not. -Every object must belong to a class. -Objects are created and destroyed |
|
|
OOS / Java Principles |
- Polymorphism - Encapsulation - Abstraction - Inheritance |
|
|
Interface vs. Abstract Class |
-Abstract class contains abstract methods. Abstract methods have no implementation.
-Interface is not a class but a type Can be satisfied by any class that implements it Must contain all method headings within it |
|
|
Final Modifier |
Method - may not be overridden by a class Class - cannot be used as a base class for any class to derive from it; also turns off late binding which prevents polymorphism. Variable - instance of this variable cannot be changed |
|
|
Polymorphism |
Polymorphism is the ability of programming languages to present a common interface for different underlying data types. |
|
|
Encapsulation |
Encapsulation provides objects with the ability to hide their internal characteristics and behavior. (Think Private, Public, Protected) |
|
|
Abstraction |
Abstraction is the process of separating ideas from specific instances and thus, develop classes in terms of their own functionality, instead of their implementation details. |
|
|
Inheritance |
Inheritance provides an object with the ability to acquire the fields and methods of another class, called base class. |
|
|
Static Modifier |
The static keyword denotes that a member variable or method can be accessed, without requiring an instantiation of the class to which it belongs |
|
|
Finally Block |
The finally block is placed after a try catch block and executes the code within regardless of whether an exception is thrown or not in the try block. |
|
|
Diamond Problem / Multiple Inheritance |
Java does not allow multiple inheritance yet uses interfaces which implementations are singly inherited. Thus the Diamond problem does not exist. |
|
|
What is a class? |
A class is a blue print for which individual objects are created. |
