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Senior Acquisitions Editor: Kenyon Brown Development Editor: David Clark Technical Editors: Janeice DelVecchio, Elena Felder Production editor: Rebecca anderson Copy Editor: Judy Flynn Editorial Manager: Mary Beth Wakefield Production Manager: Kathleen Wisor E Book Designer: Judy Fung and Bill Gibson Proofreader: Nancy Carrasco Project Coordinator, Cover: Brent Savage Cover Designer: Wiley Cover Image: @Getty Images Inc. Jeremy Woodhouse Copyright o 2017 by John Wiley Sons, Inc, Indianapolis, Indiana Published simultaneously in Canada ISBN:978-1-119-363392 ISBN:978-1-119-36336-1(ebk) ISBN:978-1-119-36340-8(ebk) Manufactured in the United States of america No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permit ted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA01923, (978)750-8400, fax(978)646 8600. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley Sons, Inc, 111 River Street, Hoboken, NJ 07030, (201)748-6011, fax(201)748-6008, or online at http://www.wiley.com/go/permissions. Limit of Liability/Disclaimer of Warranty: The publisher and the author make no representations or war ranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties, including without limitation warranties of fitness for a particular purpose. No warranty may be created or extended by sales or promotional materials. The advice and strategies contained herein may not be suitable for every situation. This work is sold with the understanding that the publisher is not engaged in rendering legal, accounting, or other professional services. If professional assistance is required the services of a competent professional person should be sought. Neither the publisher nor the author hall be liable for damages arising herefrom. The fact that an organization or Web site is referred to in this work as a citation and/or a potential source of further information does not mean that the author or the publisher endorses the information the organization or Web site may provide or recommendations it may make. Further, readers should be aware that internet Web sites listed in this work may have changed or disappeared between when this work was written and when it is read For general information on our other products and services or to obtain technical support, please contact our Customer Care Department within the U.S. at(877)762-2974, outside the U.S. at (317)572-3993 or fax(317)572-4002 Wiley publishes in a variety of print and electronic formats and by print-on-demand Some materi included with standard print versions of this book may not be included in e-books or in print-on-demand If this book refers to media such as a Cd or dvd that is not included in the version you purchased you maydownloadthismaterialathttp://booksupport.wileycomFormoreinformationaboutWileyprod ucts,visitwww.wileycom Library of Congress Control Number: 2017931099 TRADEMARKS: Wiley, the Wiley logo, and the Sybex logo are trademarks or registered trademarks of John Wiley Sons, Inc and/or its affiliates, in the United States and other countries, and may not be used without written permission. Java is a registered trademark of Oracle America, Inc. All other trademarks are the property of their respective owners. John Wiley sons, Inc is not associated with any product or vendor mentioned in this book 10987654321 To the new little bundle of joy my wife is carrying Scott Remembering Einstein and cv in same year. Congrats 694 anne 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 Janice Del Vecchio for being our technical editor as we wrote this book. Janice 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 janice. This book also wouldnt 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 daugh- ters, 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 mem bers of FIrst robotics FRC team 694 in addition to ftC teams 310 and 479 for their sup- port. Your questions make it so she can never forget what new learners are thinking. Go Stuy Pulse! Jeanne would also like to thank Onur Otlu and Thomas Campos for the feed back 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 read- ers 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 Sebastien 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 Scott specializes in full-stack database-driven systems, cloud-based applications, and S, tri-state New York City area. Skilled in a plethora of software languages and platform 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.linkedincom/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 men tors 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 Jeanneathttps://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 DownHomeCountryCodingathttp://www.selikoff.net In addition to this book, scott and jeanne are also the authors of o ca 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 Introduction Part OCA Chapter 1 Java Basics 3 Chapter 2 Working with Java Data Types 17 Chapter 3 Using operators and decision Constructs 33 Chapter 4 Creating and Using Arrays 49 Chapter 5 Using Loop Constructs 63 Chapter 6 Working with Methods and Encapsulation 79 Chapter 7 orking with Inheritance 97 Chapter 8 Handling Exceptions 115 Chapter 9 Working with Selected Classes from the Java API 135 Chapter 10 OCA Practice Exam 151 Part OCP 185 Chapter 11 Java class Design 187 Chapter 12 Advanced Java Class Design 205 Chapter 13 Generics and collections 223 Chapter 14 Lambda built-in Functional interfaces 239 Chapter 15 Java Stream APl 255 Chapter 16 Exceptions and Assertions 271 Chapter 17 Use Java SE8 Date/Time APl 289 Contents Chapter 18 Java o Fundamentals 301 Chapter 19 Java File I/o(NIO. 2) 319 Chapter 20 Java Concurrency 337 Chapter 21 Building Database Applications with JDBC 357 Chapter 22 Localization 371 Chapter 23 OCP Practice Exam 385 Appendix Answers to Review questions 427 ndex 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 Stud 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 an 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 particularexamobjectiveTheassumptionsarelistedathttp://education.oraclecomand 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 state- ments, 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 wrap ping 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 sup porting environment fully supports the correct compilation and execution of the code hown 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

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