1Z0-809: Java SE 8 Programming

Java Platform Overview

• Defining how the Java language achieves platform independence
• Differentiating between the Java ME, Java SE, and Java EE Platforms
• Evaluating Java libraries, middle-ware, and database options
• Defining how the Java language continues to evolve

Java Syntax and Class Review

• Creating simple Java classes
• Creating primitive variables
• Using operators
• Creating and manipulate strings
• Using if-else and switch statements
• Iterating with loops: while,do-while,for,enhanced for
• Creating arrays
• Using Java fields, constructors, and methods

Encapsulation and Subclassing

• Using encapsulation in Java class design
• Modeling business problems using Java classes
• Making classes immutable
• Creating and use Java subclasses
• Overloading methods

Overriding Methods, Polymorphism, and Static Classes

• Using access levels: private, protected, default, and public
• Overriding methods
• Using virtual method invocation
• Using varargs to specify variable arguments
• Using the instanceof operator to compare object types
• Using upward and downward casts
• Modeling business problems by using the static keyword

Abstract and Nested Classes

• Designing general-purpose base classes by using abstract classes
• Constructing abstract Java classes and subclasses
• Applying final keyword in Java
• Distinguish between top-level and nested classes

Interfaces and Lambda Expressions

• Defining a Java interface
• Choosing between interface inheritance and class inheritance
• Extending an interface
• Defaulting methods
• Anonymous inner classes
• Defining a Lambda Expression

Collections and Generics

• Creating a custom generic class
• Using the type inference diamond to create an object
• Creating a collection by using generics
• Implementing an ArrayList
• Implementing a TreeSet
• Implementing a HashMap
• Implementing a Deque
• Ordering collections

Collections Streams, and Filters

• Describing the Builder pattern
• Iterating through a collection using lambda syntax
• Describing the Stream interface
• Filtering a collection using lambda expressions
• Calling an existing method using a method reference
• Chaining multiple methods together
• Defining pipelines in terms of lambdas and collections

Lambda Built-in Functional Interfaces

• Listing the built-in interfaces included in java.util.function
• Core interfaces - Predicate, Consumer, Function, Supplier
• Using primitive versions of base interfaces
• Using binary versions of base interfaces

Lambda Operations

• Extracting data from an object using map
• Describing the types of stream operations
• Describing the Optional class
• Describing lazy processing
• Sorting a stream
• Saving results to a collection using the collect method
• Grouping and partition data using the Collectors class

Exceptions and Assertions

• Defining the purpose of Java exceptions
• Using the catch, multi-catch, and finally clauses
• Autoclose resources with a try-with-resources statement
• Recognizing common exception classes and categories
• Creating custom exceptions
• Testing invariants by using assertions

Java Date/Time API

• Creating and manage date-based events
• Creating and manage time-based events
• Combining date and time into a single object
• Working with dates and times across time zones
• Managing changes resulting from daylight savings
• Defining and create timestamps, periods and durations
• Applying formatting to local and zoned dates and times

I/O Fundamentals

• Describing the basics of input and output in Java
• Read and write data from the console
• Using streams to read and write files
• Writing and read objects using serialization

File I/O (NIO.2)

• Using the Path interface to operate on file and directory paths
• Using the Files class to check, delete, copy, or move a file or directory
• Using Stream API with NIO2

Concurrency

• Describing operating system task scheduling
• Creating worker threads using Runnable and Callable
• Using an ExecutorService to concurrently execute tasks
• Identifying potential threading problems
• Using synchronized and concurrent atomic to manage atomicity
• Using monitor locks to control the order of thread execution
• Using the java.util.concurrent collections

The Fork-Join Framework

• Parallelism
• The need for Fork-Join
• Work stealing
• RecursiveTask

Parallel Streams

• Reviewing the key characteristics of streams
• Describing how to make a stream pipeline execute in parallel
• List the key assumptions needed to use a parallel pipeline
• Defining reduction
• Describing why reduction requires an associative function
• Calculating a value using reduce
• Describing the process for decomposing and then merging work
• Listing the key performance considerations for parallel streams

Database Applications with JDBC

• Defining the layout of the JDBC API
• Connecting to a database by using a JDBC driver
• Submitting queries and get results from the database
• Specifying JDBC driver information externally
• Performing CRUD operations using the JDBC API

Localization

• Describing the advantages of localizing an application
• Defining what a locale represents
• Read and set the locale by using the Locale object
• Building a resource bundle for each locale
• Calling a resource bundle from an application
• Changing the locale for a resource bundle