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An objective‐based chapter is composed of questions that correspond to an objective set, as defined by Oracle on the 1Z0‐819 Exam. 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 the code compiles or what output it produces.

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 or split them for understanding. For example, in our study guides we presented parallel streams as part of the concurrency chapter since these concepts are often intertwined, whereas the 1Z0‐819 Exam splits concurrency and parallel streams across two separate objectives. In this book, though, the chapters are organized around Oracle's objectives so you can test 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.

Table I.3 shows what chapters you need to have read in our Java 11 study guides at a minimum before practicing with the questions in this book. Remember that the Java 11 Programmer I and II Study Guides contain the same material as the combined Java 11 Complete Study Guide.

TABLE I.3 Oracle Objectives and Related Study Guide Chapters

Chapter in This Book	Objectives	Complete Study Guide Chapter	OCP Programmer I Chapter	OCP Programmer II Chapter
1	Working with Java Data Types	3, 4, 5, 6, and 12	3, 4, 5, and 6	1
2	Controlling Program Flow	4	4
3	Java Object‐Oriented Approach	2, 7, 8, 9, and 12	2, 7, 8, and 9	1
4	Exception Handling	10 and 16	10	5
5	Working with Arrays and Collections	5 and 14	5	3
6	Working with Streams and Lambda Expressions	6, 15, and 18	6	4 and 7
7	Java Platform Module System	11 and 17	11	6
8	Concurrency	18		7
9	Java I/O API	19 and 20		8 and 9
10	Secure Coding in Java SE Application	22		11
11	Database Applications with JDBC	21		10
12	Localization	16		5
13	Annotations	13		2

Some of our chapters have a lot of questions. For example, Chapter 3 contains more than 200 questions. This is based on how Oracle chose to organize its objectives. We recommend doing these larger chapters in batches of 30–50 questions at a time. That way you can reinforce your learning before doing more questions. This also lets you practice with sets of questions that are closer to the length of the exam.