SCJA-drills-chap08
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| What does polymorphism stimulate? | Polymorphism stimulates code reuse.
🗑
|
||||
| What does polymorphism allow? | Polymorphism allows one object to act as either one of its superclasses, or as an interface that it implements.
🗑
|
||||
| Define the relation between subclass and class. | A subclass (more specific) “is-a” superclass (more general) object.
🗑
|
||||
| Explain the meaning of "Polymorphism is unidirectional". | More specific objects can only polymorphically act as more general objects.
🗑
|
||||
| Explain how interfaces are used in relation with polymorphism. | By implementing an interface, an object is declaring it has the functionality defined in the interface. This allows that object to polymorphically act as the interface.
🗑
|
||||
| What is programming to an interface? | Programming to an interface is the concept where the developer defines the required functionality instead of defining strict object data types.
🗑
|
||||
| What does programming to an interface allow? | Programming to an interface allows other developers to interact with the code using any object they choose as long as it implements the required interfaces.
🗑
|
||||
| What is an object interchangeable with, and what characteristic related to casting does this have? | An object can be used interchangeably with any of its superclasses and with any interface it implements, without the need to be cast.
🗑
|
||||
| What is the consequence of using a more specific object polymorphically as a general one? | When a more specific object is polymorphically used as a general object, the more specific functionality is not available.
🗑
|
||||
| In with context is, as an example, polymorphism commonly used? | Polymorphism is commonly used for method arguments.
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
fd99
Popular Computers sets