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Review Questions

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9.1

Which is the correct way to start a new thread?

Select the one correct answer.

  1. Just create a new Thread object. The thread will start automatically.

  2. Create a new Thread object and call the method begin().

  3. Create a new Thread object and call the method start().

  4. Create a new Thread object and call the method run().

  5. Create a new Thread object and call the method resume().

9.2

When extending the Thread class to provide a thread's behavior, which method should be overridden?

Select the one correct answer.

  1. begin()

  2. start()

  3. run()

  4. resume()

  5. behavior()

9.3

Which statements are true?

Select the two correct answers.

  1. The class Thread is abstract.

  2. The class Thread implements Runnable.

  3. Classes implementing the Runnable interface must define a method named start.

  4. Calling the method run() on an object implementing Runnable will create a new thread.

  5. A program terminates when the last non-daemon thread ends.

9.4

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

public class MyClass extends Thread {
    public MyClass(String s) { msg = s; }
    String msg;
    public void run() {
        System.out.println(msg);
    }

    public static void main(String[] args) {
        new MyClass("Hello");
        new MyClass("World");
    }
}

Select the one correct answer.

  1. The program will fail to compile.

  2. The program will compile without errors and will print Hello and World, in that order, every time the program is run.

  3. The program will compile without errors and will print a never-ending stream of Hello and World.

  4. The program will compile without errors and will print Hello and World when run, but the order is unpredictable.

  5. The program will compile without errors and will simply terminate without any output when run.



    		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
    		9.1 Multitasking
    		9.2 Overview of Threads
    		9.3 Thread Creation
    		Review Questions
    		9.4 Synchronization
    		Review Questions
    		9.5 Thread Transitions
    		Review Questions
    		Chapter Summary
    		Programming Exercises
    		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