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<!doctype html>
<html lang="en">
<head>
<meta http-equiv="x-ua-compatible" content="ie=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="Study guide for the Oracle Certified Professional, Java SE 8 Programmer Exam">
<title>Java 8 Programmer II Study Guide: Exam 1Z0-809</title>
<link href="css/code.css" rel="stylesheet" type="text/css" />
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<body>
<div class="nav"></div>
<div class="container">
<div class="column intro-text">
<div class="book-cover"><img src="img/cover.jpg" /></div>
<p class="border"></p>
<a href="ch01.html" class="button-large"><i class="icon-book"></i> Read online for free</a>
<p>Hi! My name is <a href="http://eherrera.net" target="_blank">Esteban Herrera</a>.</p>
<p>The exam for the Oracle Certified Professional, Java SE 8 Programmer certification is <b>HARD</b>.</p>
<p>So I wanted to write an understandable and concise guide. One that would cover all the certification objectives. One that would cut all the fluff and that would explain in simple terms hard concepts. One that is easy to read. One that would be accessible to anyone willing to learn.</p>
<p>And here is it. </p>
<p>Are you interested in the Java 17 certification exam (1Z0-829)?<br/>I have a <a href="https://ocpj17.javastudyguide.com">guide for this exam</a>.</p>
<p>Are you interested in the Java 21 certification exam (1Z0-830)?<br/>I have a <a href="https://ocpj21.javastudyguide.com">guide for this exam</a>.</p>
<p>If you read this guide for Java 8 and like it, can you buy a copy so I can keep creating free content?</p>
<div class="buy-info"></div>
<p>This site is on <a href="https://github.com/eh3rrera/ocpj8-book">Github</a>, so you can fork it, modify it, and create pull requests.</p>
<br/>
<h3>Changelog</h3>
<h4 class="changelog-date">Sep 6, 2021</h4>
<p>Fix typos in chapters 3, 7, 12, 19, 22, 23, 29. Thanks to <a href="https://github.com/useager" target="_blank">@useager</a>.</p>
<h4 class="changelog-date">May 10, 2021</h4>
<p>Fix typo in chapters 8 and 9. Thanks to <a href="https://github.com/useager" target="_blank">@useager</a>.</p>
<h4 class="changelog-date">October 1, 2020</h4>
<p>Fix typo in chapter 18. Thanks to Ladislav Borak.</p>
<h4 class="changelog-date">June 22, 2020</h4>
<p>Fix typos in chapters 6, 7, 9, 10, 12 and 14. Thanks to <a href="https://github.com/gcarravi" target="_blank">@gcarravi</a>.</p>
<h4 class="changelog-date">June 03, 2020</h4>
<p>Fix typos in chapters 4, 16 and 28. Thanks to <a href="https://github.com/robertgherlan" target="_blank">@robertgherlan</a>.</p>
<h4 class="changelog-date">May 19, 2020</h4>
<p>Fix typos in chapters 10, 21, 22. Thanks to <a href="https://github.com/gcarravi" target="_blank">@gcarravi</a>.</p>
<h4 class="changelog-date">December 16, 2019</h4>
<p>Fix incorrect method in an example of chapter 23. Thanks to <a href="https://github.com/VishGov" target="_blank">@VishGov</a>.</p>
<h4 class="changelog-date">November 3, 2019</h4>
<p>Improve comment in chapter 16 and fix small errors in chapters 27 and 28. Thanks to <a href="https://github.com/VishGov" target="_blank">@VishGov</a>.</p>
<h4 class="changelog-date">August 29, 2019</h4>
<p>Bad example related to DST removed in chapter 22. Thanks to <a href="https://github.com/anasos" target="_blank">@anasos</a>.</p>
<h4 class="changelog-date">July 22, 2019</h4>
<p>Errors fixed in chapters 1, 2, 3, 6, 7, 8, 9. Thanks to <a href="https://github.com/ciaranmooney" target="_blank">@ciaranmooney</a>.</p>
<h4 class="changelog-date">April 12, 2019</h4>
<p>Small errors fixed in chapters 11 and 12. Thanks to <a href="https://github.com/mikewittmann" target="_blank">@mikewittmann</a>.</p>
<h4 class="changelog-date">March 31, 2019</h4>
<p>Typos fixed in chapters 12, 21, 25, 26. Thanks to <a href="https://github.com/DewaldDeJager" target="_blank">@DewaldDeJager</a>.</p>
<h4 class="changelog-date">February 13, 2019</h4>
<p>Typo fixed in chapter 2. Thanks to <a href="https://github.com/LeBaur" target="_blank">@LeBaur</a>.</p>
<h4 class="changelog-date">February 05, 2019</h4>
<p>Typo fixed in question of chapter 2. Thanks to <a href="https://github.com/Ellephy" target="_blank">@Ellephy</a>.</p>
<h4 class="changelog-date">February 01, 2019</h4>
<p>Typo fixed in chapter 10. Thanks to <a href="https://github.com/dmora77" target="_blank">@dmora77</a>.</p>
<h4 class="changelog-date">January 15, 2019</h4>
<p>Typo fixed in chapter 24. Thanks to <a href="https://github.com/doodsalc" target="_blank">@doodsalc</a>.</p>
<h4 class="changelog-date">November 15, 2018</h4>
<p>Typo fixed in chapter 22. Thanks to <a href="https://github.com/zhengye1" target="_blank">@zhengye1</a>.</p>
<h4 class="changelog-date">October 21, 2018</h4>
<p>Questions fixed in chapter 20. Thanks to <a href="https://github.com/mamuf" target="_blank">@mamuf</a>.</p>
<h4 class="changelog-date">September 25, 2018</h4>
<p>Typos fixed in chapter 10. Thanks to <a href="https://github.com/akudrin" target="_blank">@akudrin</a>.</p>
<h4 class="changelog-date">April 21, 2018</h4>
<p>Corrected content of chapter 17, 22. Thanks to <a href="https://github.com/txpokey" target="_blank">@txpokey</a>.</p>
<h4 class="changelog-date">April 18, 2018</h4>
<p>Corrected content of chapters 11, 12, 21. Thanks to <a href="https://github.com/mabiosb" target="_blank">@mabiosb</a>.</p>
<h4 class="changelog-date">April 11, 2018</h4>
<p>Corrected content of chapter 12. Thanks to <a href="http://www.linkedin.com/in/mayconcomput" target="_blank">Maycon Carvalho</a>.</p>
<h4 class="changelog-date">April 03, 2018</h4>
<p>Corrected content of chapter 30. Thanks to <a href="https://github.com/Rick84" target="_blank">@Rick84</a>.</p>
<h4 class="changelog-date">March 19, 2018</h4>
<p>Corrected content of chapters 09, 11, 17, 21, 27. Thanks to <a href="https://github.com/venwyhk" target="_blank">@venwyhk</a>.</p>
<h4 class="changelog-date">Feb 08, 2018</h4>
<p>Added missing int keyword to examples in Chapter 4. Thanks to <a href="https://github.com/venwyhk" target="_blank">@venwyhk</a>.</p>
<h4 class="changelog-date">Feb 03, 2018</h4>
<p>Corrected wrong question in Chapter 23. Thanks to <a href="https://github.com/aibeke" target="_blank">@aibeke</a>.</p>
<h4 class="changelog-date">Dec 7, 2017</h4>
<p>Corrected content of chapters 01, 02, 04, 07, 19, 24, 27, 29. Thanks to <a href="https://github.com/dpanjabi" target="_blank">@dpanjabi</a>, <a href="https://github.com/jlcscp" target="_blank">@jlcscp</a>, <a href="https://github.com/IvanMwiruki" target="_blank">@IvanMwiruki</a>, <a href="https://github.com/fleskesvor" target="_blank">@fleskesvor</a>, <a href="https://github.com/GraveyGrumps" target="_blank">@GraveyGrumps</a>, and <a href="https://github.com/avraamisvi" target="_blank">@avraamisvi</a>.</p>
<h4 class="changelog-date">Jul 08, 2017</h4>
<p>Corrected typos in chapters 7, 8, 9, 10, 11. Thanks to <a href="https://github.com/ferasinka" target="_blank">@ferasinka</a>.</p>
<h4 class="changelog-date">Apr 24, 2017</h4>
<p>Corrected typos in chapter 21. Thanks to <a href="https://github.com/shurick-k" target="_blank">@shurick-k</a>.</p>
<h4 class="changelog-date">Apr 18, 2017</h4>
<p>Corrected exam objectives of chapters 1 and 2. Thanks to <a href="https://github.com/PetrusKruger" target="_blank">@PetrusKruger</a>.</p>
<h4 class="changelog-date">Jan 10, 2017</h4>
<p>Corrected answer of question 3.6 and code sample in chapter 4. Thanks to <a href="https://github.com/mrizwansarwar" target="_blank">@mrizwansarwar</a>.</p>
<h4 class="changelog-date">Dec 29, 2016</h4>
<p>Corrected content of chapters 17 and 24. Thanks to Nicolas Gherman.</p>
<h4 class="changelog-date">Nov 11, 2016</h4>
<p>Corrected content of chapters 28, 29, 30, 1, 2, 3, 4, 5, 6, 7, 8, 9. Thanks to <a href="https://github.com/haxwell" target="_blank">@haxwell</a>.</p>
<h4 class="changelog-date">Oct 22, 2016</h4>
<p>Corrected content of chapters 23, 24, 25, 26, 27. Thanks to <a href="https://github.com/haxwell" target="_blank">@haxwell</a>.</p>
<h4 class="changelog-date">Oct 12, 2016</h4>
<p>Corrected content of chapter 1.</p>
<h4 class="changelog-date">Sep 23, 2016</h4>
<p>Corrected content of chapters 15, 18, 19 and 28. Thanks to <a href="https://github.com/HermiGinger" target="_blank">@HermiGinger</a>.</p>
<h4 class="changelog-date">Jun 07, 2016</h4>
<p>Corrected content of chapters 11 and 24. Thanks to Attila Bara.</p>
<h4 class="changelog-date">May 18, 2016</h4>
<p>Added some topics to Appendix 1.</p>
<h4 class="changelog-date">April 20, 2016</h4>
<p>Correction of code of the question 1.4. Thanks to <a href="https://github.com/sutkevton" target="_blank">@sutkevton</a>.</p>
<h4 class="changelog-date">April 09, 2016</h4>
<p>Typo fixes on chapters 21 and 22. Thanks to <a href="https://github.com/pistriak" target="_blank">@pistriak</a>.</p>
<h4 class="changelog-date">April 06, 2016</h4>
<p>First version.</p>
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