Thursday, September 5th
Review of Inheritance
Superclasses - a more general definition of a class, includes all the things that the subclasses have in common. - slide 17
Subclasses - has all of the characteristics of a superclass but more details that make it unique
Inheritance - a subclass inherits all of the superclass's methods, procedures, functions and properties.Stop n write:
1. List three superclasses in Alice.
2. Choose one of those superclasses and list three of its subclasses.
3. Open a scene and add a chicken to the scene. In the code editor click on the pull down menu next to the Scene tab and select Chicken - a new tab should open titled Chicken. Look at the terms at the top of this tab, what key word indicates that the Chicken class is a subclass of the Flyer class?
Examples of superclasses and subclasses in Alice -
Slide 19 - if you want your code to be used by other subclasses then write the code for the superclass and all subclasses will inherit the code.Slide 21 - creating your own methods - if a procedure does not exist for what you want to do you can create your own!
Slide 26 - Procedural Abstraction - if there are repetitive tasks, then write a procedure for that task so that you do not need to duplicate code.
Slide 46 - this. object identifier - when you create a procedure that can be applied to many subclasses the this. identifier is used. This refers to the instance calling the procedure, this could be Alice, a dog, a fish. This refers to the current object.
Complete Section 2-4 Rotation and Randomization practice. Save steps 1-4 as S2-4 White Rabbit Last Name. Save optional activity 1 as S2-4 Horse Last Name, activity 2 as S2-4 Penguin Flap Last Name, activity 3 as S2-4 Spinner Last Name. Demonstrate these programs for teacher check. Be sure you have comments in your code.
Complete Section 2-4 Rotation and Randomization project and save the project as Fish_4 Project Last Name. Demonstrate the working project to your instructor for teacher check.Once you have completed these sections begin working on your own animation - the one you story boarded. If you have time begin creating the scene for your animation.
Add the following Section 2-5 Vocabulary to your Java vocabulary list:
- A story that gives the animation a purpose.
- Procedures that are created by the programmer.
- A list of actions to perform a task or solve a problem.
- When each subclass object receives the methods and properties of its superclass.
- Identifies the design specifications for the animation scenario. Two types are visual and textual.
- The process of looking at programming code, identifying repetitive programming statements, and extracting them into their own methods in order to make the code easier to understand and reuse.Begin Section 2-5 Declare Procedures practice. Save steps 1-4 as S2-5 White Rabbit Last Name. Save optional activity 1 as S2-5 Flow Chart Name, activity 2 as S2-5 Helicopter Last Name, activity 3 as S2-5 Flying Last Name, activity 4 as S2-5 Bunny Soccer Last Name. Demonstrate these programs for teacher check. Be sure you have comments in your code.
Begin Section 2-5 Declare Procedures project and save the project as Fish_5 Project Last Name. Demonstrate the working project to your instructor for teacher check.Once you have completed these sections continue working on your own animation - the one you story boarded. Remember to make procedures for tasks that will be repeated often.
Homework
Review the new concepts covered in class today.