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OCP Oracle Certified Professional Java SE 17 Developer Study Guide

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Страница 1 Table of Contents List of Tables List of Illustrations Guide Pages OCP Oracle^® Certified Professional Java SE 17 Developer Study Guide Exam 1Z0-829 Страница 8Страница 9Страница 10Страница 11Страница 12 Introduction Understanding the Exam Choosing Which Exam to Take Considering the Exam Objectives Changes to the Exams Scope of Objectives Choosing the Correct Answer(s) Reading the Exam Code Encountering Out-of-Scope Material Reviewing Question Types Reading This Book Who Should Buy This Book How This Book Is Organized Conventions Used in This Book Sidebars Real World Scenaria Getting Help Interactive Online Learning Environment and Test Bank Studying for the Exam Creating a Study Plan Creating and Running the Code Sample Test Class Real World Scenaria IDE Software Identifying Your Weakest Link “Overstudying” the Online Practice Exams Applying Test-Taking Strategies Using the Provided Writing Material Understanding the Question Applying the Process of Elimination Skipping Difficult Questions Being Suspicious of Strong Words Choosing the Best Answer Answer All Questions! Getting a Good Night's Rest Taking the Exam Scheduling the Exam Taking an Online Proctored Exam The Day of the Exam Finding Out Your Score Objective Map Java SE 17 Developer (1Z0-829) Java Foundations (1Z0-811) Assessment Test Answers to Assessment Test Chapter 1 Building Blocks Learning about the Environment Major Components of Java Where Did the JRE Go? Downloading a JDK Check Your Version of Java Understanding the Class Structure Fields and Methods Comments Classes and Source Files Writing a main() Method Creating a main() Method Optional Modifiers in main() Methods Passing Parameters to a Java Program Single-File Source-Code Understanding Package Declarations and Imports Packages Wildcards Redundant Imports Naming Conflicts If You Really Need to Use Two Classes with the Same Name Creating a New Package Compiling and Running Code with Packages Compiling with Wildcards Compiling to Another Directory Three Classpath Options Compiling with JAR Files Creating a JAR File Ordering Elements in a Class Creating Objects Calling Constructors Reading and Writing Member Fields Executing Instance Initializer Blocks Following the Order of Initialization Understanding Data Types Using Primitive Types The Primitive Types Is String a Primitive? Signed and Unsigned: short and char Writing Literals Literals and the Underscore Character Using Reference Types Distinguishing between Primitives and Reference Types Creating Wrapper Classes Defining Text Blocks Declaring Variables Identifying Identifiers camelCase and snake_case Declaring Multiple Variables Initializing Variables Creating Local Variables Final Local Variables Uninitialized Local Variables Passing Constructor and Method Parameters Defining Instance and Class Variables Inferring the Type with var Type Inference of var Examples with var Real World Scenaria var in the Real World Managing Variable Scope Limiting Scope Tracing Scope Applying Scope to Classes Reviewing Scope Destroying Objects Understanding Garbage Collection Tracing Eligibility Objects vs. References Code Formatting on the Exam Summary Exam Essentials Review Questions Chapter 2 Operators Understanding Java Operators Types of Operators Operator Precedence Applying Unary Operators Complement and Negation Operators Increment and Decrement Operators Working with Binary Arithmetic Operators Arithmetic Operators Adding Parentheses Changing the Order of Operation Verifying Parentheses Syntax Division and Modulus Operators Numeric Promotion Numeric Promotion Rules Assigning Values Assignment Operator Casting Values Reviewing Primitive Assignments Applying Casting Real World Scenaria Overflow and Underflow Casting Values vs. Variables Compound Assignment Operators Return Value of Assignment Operators Comparing Values Equality Operators Relational Operators Numeric Comparison Operators instanceof Operator Invalid instanceof null and the instanceof operator Logical Operators Conditional Operators Avoiding a NullPointerException Checking for Unperformed Side Effects Making Decisions with the Ternary Operator Ternary Expression and Unperformed Side Effects Summary Exam Essentials Review Questions Chapter 3 Making Decisions Creating Decision-Making Statements Statements and Blocks The if Statement Watch Indentation and Braces The else Statement Verifying That the if Statement Evaluates to a Boolean Expression Shortening Code with Pattern Matching Reassigning Pattern Variables Pattern Variables and Expressions Subtypes Limitations of Subtype Enforcement Flow Scoping Flow Scoping and else Branches Applying switch Statements The switch Statement Combining case Values Exiting with break Statements Selecting switch Data Types Determining Acceptable Case Values The switch Expression Returning Consistent Data Types Applying a case Block Watch Semicolons in switch Expressions Covering All Possible Values Writing while Loops The while Statement The do/while Statement Infinite Loops Constructing for Loops The for Loop Real World Scenaria Why i in for Loops? Printing Elements in Reverse Working with for Loops Modifying Loop Variables The for-each Loop Controlling Flow with Branching Nested Loops Adding Optional Labels The break Statement The continue Statement The return Statement Unreachable Code Reviewing Branching Summary Exam Essentials Review Questions {buyButton}

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