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Review Questions

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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.

  1. By simply referring to the class as Base.

  2. By simply referring to the class as basemaster.Base.

  3. By simply referring to the class as net.basemaster.Base.

  4. By importing with net.basemaster.* and referring to the class as Base.

  5. 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.

  1. class Ghost {
       abstract void haunt();
   }


  2. abstract class Ghost {
       void haunt();
  }


  3. abstract class Ghost {
       void haunt() {};
   }


  4. abstract Ghost {
    abstract void haunt();
   }


  5. 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.

  1. class Link { }

  2. abstract class Link { }

  3. native class Link { }

  4. static class Link { }

  5. final class Link { }

  6. private class Link { }

  7. abstract final class Link { }



    		List of Figures
    		List of Tables
    		List of Examples
    		Foreword
    		Preface
    		Chapter 1. Basics of Java Programming
    		Chapter 2. Language Fundamentals
    		Chapter 3. Operators and Assignments
    		Chapter 4. Declarations and Access Control
    		4.1 Arrays
    		Review Questions
    		4.2 Defining Classes
    		4.3 Defining Methods
    		4.4 Constructors
    		4.5 Scope Rules
    		Review Questions
    		4.6 Packages
    		4.7 Accessibility Modifiers for Top-level Classes and Interfaces
    		4.8 Other Modifiers for Classes
    		Review Questions
    		4.9 Member Accessibility Modifiers
    		Review Questions
    		4.10 Other Modifiers for Members
    		Review Questions
    		Chapter Summary
    		Programming Exercises
    		Chapter 5. Control Flow, Exception Handling, and Assertions
    		Chapter 6. Object-oriented Programming
    		Chapter 7. Nested Classes And Interfaces
    		Chapter 8. Object Lifetime
    		Chapter 9. Threads
    		Chapter 10. Fundamental Classes
    		Chapter 11. Collections and Maps
    		Appendix A. Taking the SCPJ2 1.4 Exam
    		Appendix B. Objectives for the SCPJ2 1.4 Exam
    		Appendix C. Objectives for the Java 2 Platform Upgrade Exam
    		Appendix D. Annotated Answers to Review Questions
    		Appendix E. Solutions to Programming Exercises
    		Appendix F. Mock Exam
    		Appendix G. Number Systems and Number Representation
    		Appendix H. About the CD
    		Single-User License Agreement