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Abstract_vs_Interface.pdf
1.
Java Programming Abstract Class vs. Interface Author: Scott Michael Anderson Date : 05/12/2022
2.
Java Programming Abstract Class vs. Interface 1. The keyword interface is used to declare interfaces, while the keyword abstract is used to define abstract classes. 2. Interfaces can only contain abstract methods, while abstract classes can contain a mix of abstract and non‐abstract methods. All methods in an interface are abstract. 3. An interface can extend from multiple interfaces. 4. Interfaces can provide implementation with default methods. 5. A class can implement one or more interfaces. 6. A class can extend from one and only one parent class. ‐ Multiple inheritance is not supported at the class level. 7. Abstract vs. Interface Variable Types ‐
Interfaces can only contain final and static variables while an abstract class can contain final, non‐final, static, and non‐static variables 8. Interfaces extend other interfaces
3.
4.
2. Interfaces can only contain abstract methods, while abstract classes can contain a mix of abstract and non‐abstract methods. All methods in an interface are abstract.
5.
3. Interfaces can extend from multiple interfaces
6.
4. Interfaces can provide implementation with default methods default method “shapeName()” in interface <<interface>> Shape + area() : float + shapeName() : String Circle + radius : float + Circle(radius : float) + area() : float + shapeName() : String UML Diagram: Note: The arrow direction for UML entity is not about who ‘gets’ what but rather about who references/knows who The Circle class method “shapeName()” will override the interface Shape default method “shapeName()”
7.
5. A class can implement one or more interfaces Main Output:
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5. (continued) A class can implement one or more interfaces <<interface>> Mammal + speak() + run() UML Diagram: Note: The arrow direction for UML entity is not about who ‘gets’ what but rather about who references/knows who Animal + hairColor : String + eyeColor : String + eat() <<interface>> Fish + swim() <<interface>> Reptile + crawl()
9.
6. A class can extend from one and only one parent class ‐ Multiple inheritance is not supported at the class level ‐ Example A Note: The
arrow direction for UML entity is not about who ‘gets’ what but rather about who references/knows who Animal + weight : float + eat() Mammal + heartRate : int + breathe() Extends UML Diagram: Code:
10.
6. A class can extend from one and only one parent class ‐ Multiple inheritance is not supported at the class level ‐ Example B Truck + flatbedLength : int + Truck( make : String, color : String, fuelLevel : int, flatbedLength : int) UML Diagram: Note: The
arrow direction for UML entity is not about who ‘gets’ what but rather about who references/knows who Vehicle + make : String + color : String + isRunning : Boolean + fuelLevel : int + Vehicle( make : String, color : String, fuelLevel : int) + getMake() : String + setMake(make : String) + getColor() : String + setColor(color : String) + isRunning() : Boolean + setRunning(isRunning : Boolean) + getFuelLevel() : int + setFuelLevel(fuelLevel : int) Extends
11.
7. Abstract vs. Interface Variable Types ‐ Interfaces can only contain final and static variables while an abstract class can contain final, non‐final, static, and non‐static variables Abstract Final variables Non‐Final variables Static variables Non‐static variables Interfaces Final variables Static variables
12.
8. Interfaces extend other interfaces <<interface>> Mammal + speak() + run() UML Diagram: Note: The arrow direction for UML entity is not about who ‘gets’ what but rather about who references/knows who <<interface>> Animal + hairColor : String + eyeColor : String + eat() <<interface>> Fish + swim() <<interface>> Reptile + crawl() Extends Extends Extends
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