Overview of what's new in Java 8

• General view of additions: 195 new entities (classes, interfaces, etc.).
• Lambda expressions.
• Writing SQL code in Java 8 code.
• Default implementations of interfaces and @FunctionalInterface, new annotations.
• Upgrades to streams.
• The new date and time management API.
• Upgrades to the APIs java.lang, java.util, java.net, etc.
• The ability to run JavaScript code with Java 8 Nashorn.

Lambda expressions

• Notion of embedded anonymous classes, improvements made by the lambda expression concept.
• Syntactical aspects (declaration, implementation, passing parameters, range of variables, etc.)
• The concept of a “functor” through “functional” interfaces and the java.util.function package.
• Using lambda-expressions to work with collections.
• Contributions in writing SQ code. Listeners...

Advanced functional programming

• The use of @FunctionalInterface.
• Functional interfaces provided by JDK 8.
• Predicate, Function, Supplier, Consumer, etc.
• References to methods and constructors.

Java 8 Nashorn

• JavaScript within Java? From Rhino in Java 7 to Oracle Nashorn, the ECMAScript-262 engine of Java 8.
• Using the jjs command line.
• Calling JavaScript code from a Java application, either directly or with a separate .js file.
• Calling Java code from a JavaScript script.

New Date and Time API

• The difficulties caused by the Date and GregorianCalendar APIs, the JodaTime alternative, and JSR 310.
• The concepts of machine time and human time, the basic principles of the new API.
• Machine time management with java.time.Instant and java.time.Duration.
• Human time with java.time.LocalDate, java.time.LocalTime, java.time.LocalDateTime.

Other new features

• The new streams.
• Map-reduce.