CSE 2231 - Abstract Classes PDF 15 janv. 2019 Every class

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

[PDF] CSE 2231 - Abstract Classes 15 janv. 2019 Every class