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Review Questions

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4.17

Given the following definition of a class, which fields are accessible from outside the package com.corporation.project?

package com.corporation.project;

public class MyClass {
              int i;
    public    int j;
    protected int k;
    private   int l;
}

Select the two correct answers.

  1. Field i is accessible in all classes in other packages.

  2. Field j is accessible in all classes in other packages.

  3. Field k is accessible in all classes in other packages.

  4. Field k is accessible in subclasses only in other packages.

  5. Field l is accessible in all classes in other packages.

  6. Field l is accessible in subclasses only in other packages.

4.18

How restrictive is the default accessibility compared to public, protected, and private accessibility?

Select the one correct answer.

  1. Less restrictive than public.

  2. More restrictive than public, but less restrictive than protected.

  3. More restrictive than protected, but less restrictive than private.

  4. More restrictive than private.

  5. Less restrictive than protected from within a package, and more restrictive than protected from outside a package.

4.19

Which statement is true about accessibility of members?

Select the one correct answer.

  1. Private members are always accessible from within the same package.

  2. Private members can only be accessed by code from within the class of the member.

  3. A member with default accessibility can be accessed by any subclass of the class in which it is defined.

  4. Private members cannot be accessed at all.

  5. Package/default accessibility for a member can be declared using the keyword default.



    		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