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OCA: Oracle Certified Associate Java SE 8 Programmer I Study Guide: Exam 1Z0-808

By : Jeanne Boyarsky, Scott Selikoff

OCA: Oracle Certified Associate Java SE 8 Programmer I Study Guide: Exam 1Z0-808

By: Jeanne Boyarsky, Scott Selikoff

Overview of this book

OCA, Oracle Certified Associate Java SE 8 Programmer I Study Guide, Exam 1Z0-808 is a comprehensive study guide for those taking the Oracle Certified Associate Java SE 8 Programmer I exam (1Z0-808). With complete coverage of 100% of the exam objectives, this book provides everything you need to know to confidently take the exam. The release of Java 8 brought the language’s biggest changes to date, and for the first time, candidates are required to learn functional programming to pass the exam. This study guide has you covered, with thorough functional programming explanation and information on all key topic areas Java programmers need to know. You’ll cover Java inside and out and learn how to apply it efficiently and effectively to create solutions applicable to real-world scenarios.

Free Chapter

Title Page

Title Page

Copyright

Copyright

Publisher's Note

Publisher's Note

Dedication

Dedication

Acknowledgments

Acknowledgments

About the Authors

About the Authors

Introduction

Introduction

The OCA Exam

Scheduling the Exam

The Day of the Exam

Finding Out Your Score

Exam Questions

Getting Started

Getting Help

Who Should Buy This Book

How This Book Is Organized

Free Online Learning Environment

Conventions Used in This Book

OCA Exam Objectives

Assessment Test

Assessment Test

Answers to Assessment Test

Chapter 1: Java Building Blocks

Chapter 1: Java Building Blocks

Understanding the Java Class Structure

Writing a main() Method

Understanding Package Declarations and Imports

Creating Objects

Distinguishing Between Object References and Primitives

Declaring and Initializing Variables

Understanding Default Initialization of Variables

Understanding Variable Scope

Ordering Elements in a Class

Destroying Objects

Benefits of Java

Summary

Exam Essentials

Review Questions

Chapter 2: Operators and Statements

Chapter 2: Operators and Statements

Understanding Java Operators

Working with Binary Arithmetic Operators

Working with Unary Operators

Using Additional Binary Operators

Understanding Java Statements

Understanding Advanced Flow Control

Summary

Exam Essentials

Review Questions

Chapter 3: Core Java APIs

Chapter 3: Core Java APIs

Creating and Manipulating Strings

Using the StringBuilder Class

Understanding Equality

Understanding Java Arrays

Understanding an ArrayList

Working with Dates and Times

Summary

Exam Essentials

Review Questions

Chapter 4: Methods and Encapsulation

Chapter 4: Methods and Encapsulation

Designing Methods

Working with Varargs

Applying Access Modifiers

Passing Data Among Methods

Overloading Methods

Creating Constructors

Encapsulating Data

Writing Simple Lambdas

Summary

Exam Essentials

Review Questions

Chapter 5: Class Design

Chapter 5: Class Design

Introducing Class Inheritance

Creating Abstract Classes

Implementing Interfaces

Understanding Polymorphism

Summary

Exam Essentials

Review Questions

Chapter 6: Exceptions

Chapter 6: Exceptions

Understanding Exceptions

Using a try Statement

Recognizing Common Exception Types

Calling Methods That Throw Exceptions

Summary

Exam Essentials

Review Questions

Free Online Learning Environment

Free Online Learning Environment

End User License Agreement

End User License Agreement

Appendix A: Answers to Review Questions

Appendix A: Answers to Review Questions

Chapter 1: Java Building Blocks

Chapter 2: Operators and Statements

Chapter 3: Core Java APIs

Chapter 4: Methods and Encapsulation

Chapter 5: Class Design

Chapter 6: Exceptions

Appendix B: Study Tips

Appendix B: Study Tips

Studying for the Test

Taking the Test

Passing Data Among Methods

Java is a “pass-by-value” language. This means that a copy of the variable is made and the method receives that copy. Assignments made in the method do not affect the caller. Let's look at an example:

2: public static void main(String[] args) {
3:   int num = 4;
4:   newNumber(num);
5:   System.out.println(num);     // 4
6: }
7: public static void newNumber(int num) {
8:   num = 8;
9: }

On line 3, num is assigned the value of 4. On line 4, we call a method. On line 8, the num parameter in the method gets set to 8. Although this parameter has the same name as the variable on line 3, this is a coincidence. The name could be anything. The exam will often use the same name to try to confuse you. The variable on line 3 never changes because no assignments are made to it.

Now that you've seen primitives, let's try an example with a reference type. What do you think is output by the following code?

public static void main(String[] args...

CONTINUE READING

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Tech Concepts

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Programming languages

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