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- Herausgeber: John Wiley & Sons
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
Test your knowledge and prepare for the OCA/OCP exams OCA/OCP Java SE 8 Programmer Practice Tests complements the Sybex OCA: Oracle Certified Associate Java SE 8 Programmer I Certification Study Guide and the OCP: Oracle Certified Professional Java SE 8 Programmer II Study Guide for exams 1Z0-808 and 1ZO-809 by providing last minute review of 100% of exam objectives. Get the advantage of over 1,000 expert crafted questions that not only provide the answer, but also give detailed explanations. You will have access to unique practice questions that cover all 21 objective domains in the OCA/OCP exams in the format you desire--test questions can also be accessed via the Sybex interactive learning environment. Two additional practice exams will ensure that you are ready for exam day. Whether you have studied with Sybex study guides for your OCA/OCP or have used another brand, this is your chance to test your skills. * Access to all practice questions online with the Sybex interactive learning environment * Over 1,000 unique practice questions and 2 practice exams include expert explanations * Covers 100% of all 21 OCA/OCP objective domains for Exams 1Z0-809 and 1Z0-809 Studying the objectives are one thing, but diving deeper and uncovering areas where further attention is needed can increase your chance of exam day success. Full coverage of all domains shows you what to expect on exam day, and accompanying explanations help you pinpoint which objectives deserve another look.
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Java® SE 8 Programmer
Scott Selikoff
Jeanne Boyarsky
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Copyright © 2017 by John Wiley & Sons, Inc., Indianapolis, Indiana
Published simultaneously in Canada
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To the new little bundle of joy my wife is carrying. — Scott
Remembering Einstein and CV in same year. Congrats 694! — Jeanne
Acknowledgments
Scott and Jeanne would like to thank numerous individuals for their contribution to this book. Thank you to David Clark for guiding us through the process and making the book better in so many ways. Thank you to Janeice DelVecchio for being our technical editor as we wrote this book. Janeice pointed out many subtle errors in addition to the big ones. And thank you to Elena Felder for being our technical proofreader and finding the errors that we managed to sneak by Janeice. This book also wouldn’t be possible without many people at Wiley, including Kenyon Brown, Rebecca Anderson, Judy Flynn, Nancy Carrasco, and so many others.
Scott could not have reached this point without the help of a small army of people, led by his perpetually understanding wife, Patti, the most wonderful mother their twin daughters, Olivia and Sophia, could ask for. Professors Johannes Gehrke and John H. Hubbard of Cornell University always believed in him and knew he would excel in his career. Scott would like to extend his gratitude to his wonderfully patient co-author Jeanne, on this their third book. “I don’t know how she puts up with me, but I’m glad she does and thrilled at the quality of books we produce.” A big thanks to Matt Dalen, who has been a great friend, sounding board, and caring father to the wonderfully sweet Olivia Dalen. Joel McNary introduced Scott to CodeRanch.com and encouraged him to post regularly, a step that changed his life. Finally, Scott would like to thank his mother and retired teacher, Barbara Selikoff, for teaching him the value of education and his father, Mark Selikoff, for instilling in him the benefits of working hard.
Jeanne would personally like to thank everyone at CodeRanch.com who asked and responded to OCA and OCP questions and comments about our first two books. Having dialog with the readers made this book even stronger. Jeanne would like to thank the members of FIRST robotics FRC team 694 in addition to FTC teams 310 and 479 for their support. Your questions make it so she can never forget what new learners are thinking. Go StuyPulse! Jeanne would also like to thank Onur Otlu and Thomas Campos for the feedback on some localization questions. Finally, Jeanne would like to thank Scott for being a great co-author and “not getting tired of me.”
Last but not least, both Scott and Jeanne would like to give a big thank you to the readers of our OCA 8 and OCP 8 books. Hearing from all of you who enjoyed the book and passed the exam is a great feeling. We’d also like to thank those who pointed out errors and made suggestions for improvements in our OCP book. As of December 2016, the top three were Guillaume Bailly, Thalita Vergilio, and Sébastien Canonica. We also would like to thank Olivier Chalet, Mihaela Hetea, Peter Deak, Anton Shaikin, Ramya R, Tim Moroz, Aurelien Gamet, Javid Azimli, Salim Rahal, and Sander Wamelink.
About the Authors
Scott Selikoff is a professional software consultant, author, and owner of Selikoff Solutions, LLC, which provides software development solutions to businesses in the tri-state New York City area. Skilled in a plethora of software languages and platforms, Scott specializes in full-stack database-driven systems, cloud-based applications, and service-oriented architectures.
A native of Toms River, New Jersey, Scott achieved his Bachelor of Arts from Cornell University in Mathematics and Computer Science in 2002, after three years of study. In 2003, he received his Masters of Engineering in Computer Science, also from Cornell University.
As someone with a deep love of education, Scott has always enjoyed teaching others new concepts. He’s given lectures at Cornell University and Rutgers University, as well as conferences including the Server Side Java Symposium. Scott lives in New Jersey with his loving wife, Patti; amazing twin toddler daughters, Olivia and Sophia; and two very playful dogs, Webby and Georgette. You can find out more about Scott at http://www.linkedin.com/in/selikoff.
Jeanne Boyarsky has worked as a Java developer for over 14 years at a bank in New York City where she develops, mentors, and conducts training. Besides being a senior moderator at CodeRanch.com in her free time, she works on the forum’s code base. Jeanne also mentors the programming division of a FIRST robotics team, where she works with students just getting started with Java.
Jeanne got her Bachelor of Arts degree in 2002 in Computer Science and her Masters in Computer Information Technology in 2005. She enjoyed getting her Masters degree in an online program while working full time. This was before online education was cool! Jeanne is also a Distinguished Toastmaster and a Scrum Master. You can find out more about Jeanne at https://coderanch.com/wiki/660334.
Scott and Jeanne are both moderators on the CodeRanch.com forums, and they can be reached there for questions and comments. They also co-author a technical blog called Down Home Country Coding at http://www.selikoff.net.
In addition to this book, Scott and Jeanne are also the authors of OCA Oracle Certified Associate Java SE 8 Programmer I Study Guide (Sybex, 2015) and OCP Oracle Certified Professional Java SE 8 Programmer II Study Guide (Sybex, 2016). More recently, these two books have been combined into the single release OCA / OCP Java SE 8 Programmer Certification Kit: Exam 1Z0-808 and Exam 1Z0-809 (Sybex 2016).
Contents
Acknowledgments
About the Authors
Introduction
Choosing an Exam
Who Should Buy This Book
How This Book Is Organized
Reviewing Exam Changes
Ready to Take the Exam
Need More Help Preparing?
Bonus Contents
Part I OCA
Chapter 1 Java Basics
Chapter 2 Working with Java Data Types
Chapter 3 Using Operators and Decision Constructs
Chapter 4 Creating and Using Arrays
Chapter 5 Using Loop Constructs
Chapter 6 Working with Methods and Encapsulation
Chapter 7 Working with Inheritance
Chapter 8 Handling Exceptions
Chapter 9 Working with Selected Classes from the Java API
Chapter 10 OCA Practice Exam
Part II OCP
Chapter 11 Java Class Design
Chapter 12 Advanced Java Class Design
Chapter 13 Generics and Collections
Chapter 14 Lambda Built-in Functional Interfaces
Chapter 15 Java Stream API
Chapter 16 Exceptions and Assertions
Chapter 17 Use Java SE 8 Date/Time API
Chapter 18 Java I/O Fundamentals
Chapter 19 Java File I/O (NIO.2)
Chapter 20 Java Concurrency
Chapter 21 Building Database Applications with JDBC
Chapter 22 Localization
Chapter 23 OCP Practice Exam
Appendix Answers to Review Questions
Chapter 1: Java Basics
Chapter 2: Working with Java Data Types
Chapter 3: Using Operators and Decision Constructs
Chapter 4: Creating and Using Arrays
Chapter 5: Using Loop Constructs
Chapter 6: Working with Methods and Encapsulation
Chapter 7: Working with Inheritance
Chapter 8: Handling Exceptions
Chapter 9: Working with Selected Classes from the Java API
Chapter 10: OCA Practice Exam
Chapter 11: Java Class Design
Chapter 12: Advanced Java Class Design
Chapter 13: Generics and Collections
Chapter 14: Lambda Built-in Functional Interfaces
Chapter 15: Java Stream API
Chapter 16: Exceptions and Assertions
Chapter 17: Use Java SE 8 Date/Time API
Chapter 18: Java I/O Fundamentals
Chapter 19: Java File I/O (NIO.2)
Chapter 20: Java Concurrency
Chapter 21: Building Database Applications with JDBC
Chapter 22: Localization
Chapter 23: OCP Practice Exam
Advert
EULA
List of Tables
Introduction
Table I.1
Table I.2
Table I.3
List of Illustration
Introduction
Figure I.1
Exam prerequisites
Guide
Cover
Table of Contents
Part I OCA
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Introduction
This book is intended for those taking either the 1Z0-808 or 1Z0-809 Oracle Java Programmer exams as well as those who want to test their knowledge of Java 8. If you are new to Java 8, we strongly recommend you start with a study guide to learn all of the facets of the language and come back to this book once you are thinking of taking the exam.
We recommend the best-selling OCA Oracle Certified Associate Java SE 8 Programmer I Study Guide and OCP Oracle Certified Professional Java SE 8 Programmer II Study Guide, which we happen to be the authors of, to start in your studies. Regardless of which study guide you are using to prepare, you can use this book to hone your skills, since it is based on topics on the actual exams.
Unlike the questions in our study guides, which are designed to be harder than the real exam, the questions in this book mirror the exam format. All the questions in this book tell you how many answers are correct. They will say “Choose two” or “Choose three” if more than one answer is correct.
Throughout this book, we use the same set of assumptions that Oracle uses for its exams. In many cases, these assumptions are actually accounting for unintended omissions or type-setting errors that Oracle is directing you to ignore when solving a question focused on a particular exam objective. The assumptions are listed at http://education.oracle.com and listed here for your convenience:
Missing
package
and
import
statements: If sample code does not include package or import statements, and the question does not explicitly refer to these missing statements, then assume that all sample code is in the same package, and import statements exist to support them.
No file or directory path names for classes:
If a question does not state the file names or directory locations of classes, then assume one of the following, whichever will enable the code to compile and run:
All classes are in one file.
Each class is contained in a separate file, and all files are in one directory.
Unintended line breaks:
Sample code might have unintended line breaks. If you see a line of code that looks like it has wrapped, and this creates a situation where the wrapping is significant (for example, a quoted
String
literal has wrapped), assume that the wrapping is an extension of the same line, and the line does not contain a hard carriage return that would cause a compilation failure.
Code fragments:
A code fragment is a small section of source code that is presented without its context. Assume that all necessary supporting code exists, and that the supporting environment fully supports the correct compilation and execution of the code shown and its omitted environment.
Descriptive comments:
Take descriptive comments, such as “setter and getters go here,” at face value. Assume that correct code exists, compiles, and runs successfully to create the described effect.
Choosing an Exam
The first step on the road to a Java certification is the Oracle Certified Associate 1Z0-808 (OCA 8) exam. The material includes the basic day-to-day tools every Java developer should be familiar with. Once you have completed that exam, you can move on to the more difficult Oracle Certified Professional 1Z0-809 (OCP 8) exam. This includes every topic on the first exam, along with many additional libraries and APIs that you may not even be familiar with in your career, such as the Concurrency and NIO.2 APIs.
If you already hold a Java certification, you are eligible for an upgrade exam. Table I.1 and Figure I.1 show the various pathways to the OCP 8 certification title. This book will help you prepare for all four of the exams listed in the table.
TABLE I.1 Exams this book covers
Exam Code
Name
Who should take
1Z0–808
Java Programmer I
Everyone can take this exam.
1Z0–809
Java Programmer II
Those who pass the OCA 8 exam
1Z0–810
Upgrade Java SE 7 to Java SE 8 OCP Programmer
Holders of an OCP 7 certification
1Z0–813
Upgrade to Java SE 8 OCP (Java SE 6 and all prior versions)
Holders of any of the following certifications:
SCJP/OCJP 6
SCJP/OCJP 5
SCJP 1.4
Any older SCJP certs
FIGURE I.1 Exam prerequisites
For the OCA exam, we recommend a study plan that uses our OCA Oracle Certified Associated Java SE 8 Programmer I Study Guide along with Chapters 1 through 10 of this book. For the OCP exam, we recommend a study plan that uses our OCP Oracle Certified Professional Java SE 8 Programmer II Study Guide along with Chapters 11 through 23 of this book. That’s right, this book is actually two books in one! It assists you for both the OCA and OCP exams.
Taking an Upgrade Exam
There are some subtle differences in how you should prepare if you are taking one of the upgrade exams. The good news is that if you currently hold a Java 7 OCP certification and are taking the 1Z0-810 upgrade exam, this book is all you need. While the exam contains a stronger focus on changes between Java 7 and Java 8, there aren’t any new topics not covered with the existing OCP 7 material. This means you have the same study plan as those taking the OCP for the first time.
On the other hand, if you are taking the 1Z0-813 upgrade exam and hold a Sun Certified Java Programmer (SCJP) or Oracle Certified Java Programmer (OCJP) title, then you will need additional material. This upgrade inexplicably contains material that was in the Java 7 OCP exam but removed from the Java 8 version, such as ReentrantLock and WatchService. For that, we have no explanation, although this does make the 1Z0-813 arguably the most difficult of the three OCP exams because it requires knowing everything from multiple versions of Java.
Have no fear! When we wrote our OCP Oracle Certified Professional Java SE 8 Programmer II Study Guide, we added a special 50-page appendix, Appendix C, “Upgrading from Java 6 or Earlier,” which covers the topics solely on the 1Z0-813 exam in detail. If you are taking the 1Z0-813 exam, then after completing your studies with this book, you should consult our appendix in our OCP book or a Java 7 OCP study guide so that you are prepared for all of the objectives.
Considering Other Study Paths
If you already hold a Java certification, you are not required to take an upgrade exam. Some developers find it more straightforward to start with the easier 1Z0-808 OCA exam and then take the more challenging 1Z0-809 OCP exam. If you have no experience with Java 8 or just want more practice with it, taking the OCA exam followed by the OCP exam could be a better, albeit more expensive, learning experience than taking a single upgrade exam.
Also remember, if you do hold an old Java title and want to take an upgrade exam, you will need to prove it before you will be granted the OCP 8 title, even if you pass the upgrade exam. This requires registering your older certification with Oracle’s CertView system. We’ve heard feedback from some readers who had to search through old binders and emails from over a decade ago to submit the proper documentation that allows them to be granted the OCP 8 title.
Finally, if you are new to Java certification, it is traditional to take the exams in order, with the OCA exam followed by the OCP exam. However, this is a not strict requirement. It is possible, although quite unorthodox, to take the harder OCP exam first and then circle back to take the OCA exam. In this case, you’ll be granted both OCA and OCP titles upon completion of the OCA exam. While we don’t recommend this strategy, Oracle does allow it.
Who Should Buy This Book
If you are looking to take the OCA 8 exam (1Z0-808), then Chapters 1 through 10 of this book are for you. And once you’ve passed with flying colors, you’ll have the OCP material handy in case you decide to take the exam.
If you are looking to take the OCP 8 exam (1Z0-809) or OCP 8 upgrade exam (1Z0-810), then Chapters 1 through 23 of this book are for you. While Chapters 1 through 10 are primarily focused on the OCA exam, the OCP exam is cumulative. We recommend you start reviewing the OCA Chapters (1–10) to make sure you have a solid foundation and then move on to the OCP Chapters (11–23) when you are ready.
As mentioned earlier, if you are looking to take the OCP 8 upgrade exam (1Z0-813), this book will still help for the vast majority of topics. You will need to supplement this book with a Java 7 study guide or use Appendix C in our OCP book, which focuses on the precise topics on the 1Z0-813 exam that you need to know.
Regardless of which exam you plan to take, make sure to always keep your study guide handy. This book is about honing your knowledge of Java 8, while your study guide is about building it.
How This Book Is Organized
For this book, we decided to write two books in one, divided into Parts I and II. Part I includes Chapters 1 through 10, with nine objective-based chapters for each of the OCA exam objective sets followed by a simulated OCA practice exam. Part II encompasses Chapters 11 through 23, with 12 objective-based chapters for each of the OCP exam objective sets followed by a simulated OCP practice exam.
There are some subtle differences between the objective-based chapters and practice exam chapters that you should be aware of while reading this book.
Using the Objective-Based Chapters
We designed the structure and style of each question in the objective-based chapters to reflect a more positive learning experience, allowing you to spend less time on each question but covering a broader level of material. For example, you may see two questions that look similar within a chapter but contain a subtle difference that has drastic implications on whether or not the code compiles, or what output it produces.
Each question in the objective-based chapters has exactly four options with only one correct answer. Just like the review questions in our study guide, these questions are designed so that you can answer them many times. While these questions may be easier than exam questions, they will reinforce concepts if you keep taking them on a topic you don’t feel strongly on.
In our study guides, we often group related topics into chapters. For example, if/then statements and loops, which are in separate Oracle objective sets, were presented in a single chapter on Operators and Statements in our OCA book. In this book, we decided to design our chapters solely around Oracle’s objectives so you can strengthen your skills. While you don’t need to read an entire study guide before using an objective-based chapter in this book, you do need to study the relevant objectives. Tables I.2 and I.3 show what chapters you need to have read in our study guides as a minimum before practicing with the questions in this book.
TABLE I.2 Reference in OCA study guide
Chapter in This Book
Objectives
OCA Study Guide Chapters
1
Java Basics
1
2
Working with Java Data Types
1, 3
3
Using Operators and Decision Constructs
2, 3
4
Creating and Using Arrays
3
5
Using Loop Constructs
2
6
Working with Methods and Encapsulation
4
7
Working with Inheritance
5
8
Handling Exceptions
6
9
Working with Selected Classes from the Java API
1, 3, 4
TABLE I.3 Reference in OCP study guide
Chapter in This Book
Objectives
OCP Study Guide Chapters
11
Java Class Design
1, 2
12
Advanced Java Class Design
1, 2, 3
13
Generics and Collections
3, 4
14
Lambda Built-in Functional Interfaces
2, 4
15
Java Stream API
3, 4
16
Exceptions and Assertions
6
17
Use Java SE 8 Date/Time API
5
18
Java I/O Fundamentals
8
19
Java File I/O (NIO.2)
9
20
Java Concurrency
7
21
Building Database Applications with JDBC
10
22
Localization
5
Using the Practice Exam Chapters
This book contains two full-length practice exam chapters, with Chapter 10 being an 80-question OCA practice exam and Chapter 23 being an 85-question OCP practice exam. The questions in these two chapters are quite different from the objective-based chapters in a number of important ways. These practice exam questions tend to be harder because they are designed to test your cumulative knowledge rather than reinforcing your existing skill set.
While all of the objective-based chapters had four options with only one correct answer, these questions have up to six options, with up to three correct answer choices. Based on feedback from our first two books, we do indicate exactly how many answers are correct in the practice exam chapters, as is done on the real exam. Some readers thought the lack of knowing the correct number of answers made the questions too challenging for studying.
Both practice exam chapters are designed to be taken within 150 minutes and have a passing score of 65 percent. Remember not to take the practice exam until you feel ready. There are only so many practice exams available, so you don’t want to waste a fresh attempt.
While an objective-based chapter can be completed over the course of a few days, the practice exam chapters were designed to be completed in one sitting. You should try simulating the exam experience as much as possible. This means setting aside two and a half hours, grabbing a whiteboard or scrap paper, and answering every question even if you aren’t sure of the answer. Remember, there is no penalty for guessing, and the more incorrect answers you can eliminate the better.
Reviewing Exam Changes
Oracle does change the number of questions, passing score, and time limit from time to time. In fact, the exam writers changed the number of OCA 8 questions from 77 to 80 while this book was being written! Scott and Jeanne maintain a blog that tracks updates to the real exams, as quickly as Oracle updates them:
https://www.selikoff.net/jpt
We recommend you read this page before you take the real exam, in case any of the information since the time this book was published has changed. Although less common, Oracle does add, remove, or reword objectives. When this happens, we offer free supplemental material on our website as blog entries.
Ready to Take the Exam
If you can score above 80 percent consistently on all of the chapters related to the exam you want to take, including the simulated practice exam, then you are probably ready to take the real exam. Just remember there’s a big difference between taking a practice test at home and spending hundreds of dollars to take a real exam at a test center.
We could write an entire chapter on test taking skills and study tips. Oh wait, we did! Both our OCA 8 and OCP 8 books each contain an appendix chock-full of helpful tips and suggestions that are designed to help you manage your time. They also include notes on how to eliminate obviously wrong answers so that when you have to guess, you’re choosing between two choices and not five.
Finally, although a lot of people are inclined to cram as much material as they can in the hours leading up to the exam, most studies have shown that this is a poor test-taking strategy. The best thing we can recommend that you do before the exam is to get a good night’s rest!
Need More Help Preparing?
Both of the authors are moderators at CodeRanch.com, a very large and active programming forum that is very friendly toward Java beginners. It has separate forums for each of the exams:
OCA Forum: https://coderanch.com/f/117
OCP Forum: https://coderanch.com/f/24
If you don’t understand a question, even after reading the explanation, feel free to ask about it in one of those forums. You’ll get an answer from a knowledgeable Java programmer. It might even be one of us.
Good luck on the exam and happy studies!
Bonus Contents
This book has a web page that provides all the questions in this book using Wiley’s interactive online test engine.
You can link to this from www.wiley.com/go/sybextestprep.
