Review Questions

4.14	Given the following class, which of these are valid ways of referring to the class from outside of the package net.basemaster ? package net.basemaster; public class Base { // ... } Select the two correct answers. By simply referring to the class as Base . By simply referring to the class as basemaster.Base . By simply referring to the class as net.basemaster.Base . By importing with net.basemaster.* and referring to the class as Base . By importing with net.* and referring to the class as basemaster.Base .
4.15	Which one of the following class definitions is a valid definition of a class that cannot be instantiated ? Select the one correct answer. class Ghost { abstract void haunt(); } abstract class Ghost { void haunt(); } abstract class Ghost { void haunt() {}; } abstract Ghost { abstract void haunt(); } static class Ghost { abstract haunt(); }
4.16	Which one of the following class definitions is a valid definition of a class that cannot be extended? Select the one correct answer. class Link { } abstract class Link { } native class Link { } static class Link { } final class Link { } private class Link { } abstract final class Link { }