Tweet
Tweet

Slide 1

Slide 1 text

jgs CSE 205 Object-Oriented Programming and Data Structures Lecture 08: Interfaces Dr. Javier Gonzalez-Sanchez [email protected] javiergs.engineering.asu.edu | javiergs.com PERALTA 230U Office Hours: By appointment

Slide 2

Slide 2 text

jgs Previously …

Slide 3

Slide 3 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 3 jgs Abstract Classes § cannot be instantiated and contains one or more abstract methods (no definition body). § can contain methods § can contain data declarations

Slide 4

Slide 4 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 4 jgs Abstract Classes

Slide 5

Slide 5 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 5 jgs Abstract Methods § An abstract method is a method without a body. § It cannot be final or static because there is no definition, and it should be changed later.

Slide 6

Slide 6 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 6 jgs Abstract Methods

Slide 7

Slide 7 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 7 jgs Abstract Methods

Slide 8

Slide 8 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 8 jgs UML Class Diagram – abstract keyword

Slide 9

Slide 9 text

jgs Interfaces

Slide 10

Slide 10 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 10 jgs Interfaces § Interfaces contains behaviors that a class implements. § An interface cannot be instantiated § An interface does not contain any constructors. § In an interface, all methods are abstract. § An interface cannot contain instance fields. The only fields that can appear in an interface must be declared both static and final. § An interface is not extended by a class; it is implemented by a class. § An interface can extend multiple interfaces.

Slide 11

Slide 11 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 11 jgs Interfaces

Slide 12

Slide 12 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 12 jgs Interfaces

Slide 13

Slide 13 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 13 jgs Interfaces

Slide 14

Slide 14 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 14 jgs Let’s Work

Slide 15

Slide 15 text

jgs Polymorphism

Slide 16

Slide 16 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 16 jgs Polymorphism § A polymorphic reference is a reference variable that can refer to different types of objects at different points in time. § Polymorphic references are resolved at run-time, not during compilation.

Slide 17

Slide 17 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 17 jgs Abstract Methods

Slide 18

Slide 18 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 18 jgs Polymorphism

Slide 19

Slide 19 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 19 jgs Polymorphism

Slide 20

Slide 20 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 20 jgs Polymorphism

Slide 21

Slide 21 text

Javier Gonzalez-Sanchez | CSE205 | Fall 2021 | 21 jgs Questions

Slide 22

Slide 22 text

jgs CSE 205 Object-Oriented Programming and Data Structures Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall 2021 Copyright. These slides can only be used as study material for the class CSE205 at Arizona State University. They cannot be distributed or used for another purpose.