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Review Questions

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5.1

What will be the result of attempting to compile and run the following class?

public class IfTest {
    public static void main(String[] args) {
        if (true)
        if (false)
        System.out.println("a");
        else
        System.out.println("b");
    }
}

Select the one correct answer.

  1. The code will fail to compile because the syntax of the if statement is incorrect.

  2. The code will fail to compile because the compiler will not be able to determine which if statement the else clause belongs to.

  3. The code will compile correctly and display the letter a when run.

  4. The code will compile correctly and display the letter b when run.

  5. The code will compile correctly, but will not display any output.

5.2

Which statements are true?

Select the three correct answers.

  1. The conditional expression in an if statement can have method calls.

  2. If a and b are of type boolean, the expression (a = b) can be the conditional expression of an if statement.

  3. An if statement can have either an if clause or an else clause.

  4. The statement if (false) ; else ; is illegal.

  5. Only expressions which evaluate to a boolean value can be used as the condition in an if statement.

5.3

What, if anything, is wrong with the following code?

void test(int x) {
    switch (x) {
        case 1:
        case 2:
        case 0:
        default:
        case 4:
    }
}

Select the one correct answer.

  1. The variable x does not have the right type for a switch expression.

  2. The case label 0 must precede case label 1.

  3. Each case section must end with a break statement.

  4. The default label must be the last label in the switch statement.

  5. The body of the switch statement must contain at least one statement.

  6. There is nothing wrong with the code.

5.4

Which of these combinations of switch expression types and case label value types are legal within a switch statement?

Select the one correct answer.

  1. switch expression of type int and case label value of type char.

  2. switch expression of type float and case label value of type int.

  3. switch expression of type byte and case label value of type float.

  4. switch expression of type char and case label value of type long.

  5. switch expression of type boolean and case value of type boolean.



    		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
    		5.1 Overview of Control Flow Statements
    		5.2 Selection Statements
    		Review Questions
    		5.3 Iteration Statements
    		5.4 Transfer Statements
    		Review Questions
    		5.5 Stack-based Execution and Exception Propagation
    		5.6 Exception Types
    		5.7 Exception Handling: 'try', 'catch', and 'finally'
    		5.8 'throw' Statement
    		5.9 'throws' Clause
    		Review Questions
    		5.10 Assertions
    		Review Questions
    		Chapter Summary
    		Programming Exercises
    		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