UML Class Diagrams
Implements and Extends implements –. “dashed line” Interface Abstract Class
Inheritance & Abstract Classes
A class that extends another class is a subclass that inherits all fields and methods. (but not constructors) of the superclass.
CSE 2231 - Abstract Classes
15 janv. 2019 Every class in Java extends Object which is a special built-in class that provides default implementations for the.
Abstract Method & Abstract Classes
An abstract method specifies behavior but no implementation. Example: In the Number class intValue
Abstract Classes and Interfaces
In an abstract subclass extended from an abstract super-class we can choose to implement the inherited abstract methods OR to postpone the.
Lecture 08 - Abstract Classes and Interfaces Part 1
abstract method in abstract class. ? If a subclass of an abstract superclass does not implement all the abstract methods the.
Interface
// Note: We do not implement Payable method getPaymentAmount here so. // this class must be declared abstract to avoid a compilation error. } // end abstract
Abstract Classes and Interfaces Abstract Class (1) Abstract Class (2
? Polygon cannot be used as a dynamic type. ? Writing new Polygon() is forbidden! 3 of 20. Abstract Class (3) public class Rectangle extends Polygon {.
Class Design Principles
it its implementation must abstract over variable subparts of behavior. Class Design Principles: The Open-Closed Principle (OCP)
abstract cl-ass Boat private String myName private int myCapacj_ty
methods need to be implemented we cannot instantiate an abstract class. Like the interface
