Chapter 8 Test

1. Using code from Try This section 8-1, enter the ICharQ interface and its three implementations in one package called qpack. Maintaining the class IQDemo queue demo in standard package, show how to import and use the qpack classes.
2. What is namespace? Why is it important that Java lets you split the namespace?
3. Packages are stored in ___________.
4. Explain the difference between protected and standard access.
5. Explain the two ways in which members of a package can be used by other packages.
6. “One interface, many methods” is a key principle of Java. What resource does best example?
7. How many classes can implement an interface? How many interfaces does one class can implement?
8. Can interfaces be extended?
9. Create an interface for the Vehicle class from Chapter7. Call her the IVehicle.
10. Variables declared in an interface are implicitly static and final. Can they be shared with other parts of a program?
11. A package is basically a container for classes. True or false?
12. What standard Java package is automatically imported into a program?
13. What keyword is used to declare the default method of an interface?
14. As of JDK 8, is it possible to define a static method in an interface?
15. Suppose the ICharQ interface shown in Try This 8-1 had already been in widespread use for years. Now, you want to add to it a method called reset( ), which will be used to restore the queue to its condition empty initial. Assuming using JDK 8 or later, how can this be done without invalidating existing codes?
16. How is a static method of an interface called?

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