OCA Oracle Certified Associate, Java SE

Java Building Blocks

• Understanding the Java Class Structure
  • Fields and Methods
  • Comments
  • Classes vs. Files
• Writing a main() Method
• Understanding Package Declarations and Imports
  • Wildcards
  • Redundant Imports
  • Naming Conflicts
  • Creating a New Package
  • Code Formatting on the Exam

Java Building Blocks

• Creating Objects
  • Constructors
  • Reading and Writing Object Fields
  • Instance Initializer Blocks
  • Order of Initialization
• Distinguishing Between Object References and Primitives
• Primitive Types
• Reference Types
• Key Differences
• Declaring and Initializing Variables
  • Declaring Multiple Variables

Java Building Blocks

• Identifiers
• Understanding Default Initialization of Variables
  • Local Variables
  • Instance and Class Variables
• Understanding Variable Scope
• Ordering Elements in a Class
• Destroying Objects
  • Garbage Collection
  • finalize()
• Benefits of Java

Operators and Statements

• Understanding Java Operators
• Working with Binary Arithmetic Operators
  • Arithmetic Operators
  • Numeric Promotion
• Working with Unary Operators
  • Logical Complement and Negation Operators
  • Increment and Decrement Operators
• Using Additional Binary Operators
  • Assignment Operators
  • Compound Assignment Operators
  • Relational Operators
  • Logical Operators
  • Equality Operators

Flow Control

• Understanding Java Statements
  • The if-then Statement
  • The if-then-else Statement
  • The switch Statement
  • The while Statement
  • The do-while Statement
  • The for Statement
• Understanding Advanced Flow Control
  • Nested Loops
  • Adding Optional Labels
  • The break Statement
  • The continue Statement

Core Java APIs

• Creating and Manipulating Strings
  • Concatenation
  • Immutability
  • The String Pool
  • Important String Methods
  • Method Chaining
• Using the StringBuilder Class
  • Mutability and Chaining
  • Creating a StringBuilder
  • Important StringBuilder Methods
  • StringBuilder vs. StringBuffer
• Understanding Equality

Core Java APIs

• Understanding Java Arrays
  • Creating an Array of Primitives
  • Creating an Array with Reference Variables
  • Using an Array
  • Sorting
  • Searching
  • Varargs
  • Multidimensional Arrays
• Understanding an ArrayList
  • Creating an ArrayList
  • Using an ArrayList
  • Wrapper Classes
  • Autoboxing
  • Converting Between array and List
  • Sorting

Core Java APIs

• Working with Dates and Times
  • Creating Dates and Times
  • Manipulating Dates and Times
  • Working with Periods
  • Formatting Dates and Times
  • Parsing Dates and Times

Methods and Encapsulation

• Designing Methods
  • Optional Specifiers
  • Return Type
  • Method Name
  • Parameter List
  • Optional Exception List
  • Method Body

Methods and Encapsulation

• Applying Access Modifiers
  • Private Access
  • Default (Package Private) Access
  • Protected Access
  • Public Access
  • Designing Static Methods and Fields
  • Calling a Static Variable or Method
  • Static vs. Instance
  • Static Variables
  • Static Initialization
  • Static Imports

Methods and Encapsulation

• Working with Varargs
• Passing Data Among Methods
• Overloading Methods
• Creating Constructors
  • Default Constructor
  • Overloading Constructors
  • Final Fields
  • Order of Initialization
• Encapsulating Data
  • Creating Immutable Classes
• Writing Simple Lambdas
  • Lambda Example
  • Lambda Syntax
  • Predicates

Class Design

• Introducing Class Inheritance
  • Extending a Class
  • Applying Class Access Modifiers
  • Creating Java Objects
  • Defining Constructors
  • Calling Inherited Class Members
  • Inheriting Methods
  • Inheriting Variables
• Creating Abstract Classes
  • Defining an Abstract Class
  • Creating a Concrete Class
  • Extending an Abstract Class

Class Design

• Implementing Interfaces
  • Defining an Interface
  • Inheriting an Interface
  • Interface Variables
  • Default Interface Methods
  • Static Interface Methods
• Understanding Polymorphism
  • Object vs. Reference
  • Casting Objects
  • Virtual Methods
  • Polymorphic Parameters
  • Polymorphism and Method Overriding

Exceptions

• Understanding Exceptions
  • The Role of Exceptions
  • Understanding Exception Types
  • Throwing an Exception
• Using a try Statement
  • Adding a finally Block
  • Catching Various Types of Exceptions
  • Throwing a Second Exception
• Recognizing Common Exception Types
  • Runtime Exceptions
  • Checked Exceptions
  • Errors
• Calling Methods That Throw Exceptions
  • Subclasses
  • Printing an Exception