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Review Questions

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10.1

What is the return type of the hashCode() method in the Object class?

Select the one correct answer.

  1. String

  2. int

  3. long

  4. Object

  5. Class

10.2

Which statement is true?

Select the one correct answer.

  1. If the references x and y denote two different objects, then the expression x.equals(y) is always false.

  2. If the references x and y denote two different objects, then the expression (x.hashCode() == y.hashCode()) is always false.

  3. The hashCode() method in the Object class is declared final.

  4. The equals() method in the Object class is declared final.

  5. All arrays have a method named clone.

10.3

Which exception can the clone() method of the Object class throw?

Select the one correct answer.

  1. CloneNotSupportedException

  2. NotCloneableException

  3. IllegalCloneException

  4. NoClonesAllowedException



    		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
    		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
    		10.1 Overview of the 'java.lang' Package
    		10.2 The 'Object' Class
    		Review Questions
    		10.3 The Wrapper Classes
    		Review Questions
    		10.4 The 'Math' Class
    		Review Questions
    		10.5 The 'String' Class
    		Review Questions
    		10.6 The 'StringBuffer' Class
    		Review Questions
    		Chapter Summary
    		Programming Exercises
    		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