Lambdas - anonymous inner class syntax versus lambda expressions.
Functional Interfaces from the API - sample code explaining Predicate/BiPredicate, Consumer/BiConsumer
Functional Interfaces from the API - sample code explaining Supplier, Function/BiFunction
Functional Interfaces from the API - sample code explaining UnaryOperator, BinaryOperator
Method References - their relationship with lambdas. Different types of method references explained with code - bound, unbound, static and constructor.
Method References - how the context helps in understanding them.
Streams - what they are, stream pipelines and stream laziness.
Streams - Teal operations.
Streams - Teal operations - reduce, collect explained with code examples.
Streams - collect using API collectors explained with code examples e.g. CollectorsDOTtoMap, CollectorsDOTgroupingBy and CollectorsDOTpartitioningBy
Streams - Intermediate Operations explained with code examples e.g. filter, distinct, limit, map, flatMap and sorted.
Streams - stateful and short-circuiting intermediate operations explained.
Streams - Primitive Streams - how to create them, what their API's look like and how to map between them.
Streams - mapping between Object streams and primitive streams and vice versa.
Optionals - what they are and why they are useful. Sample code demonstrating their use.
Parallel Streams - how to create them. Sequential versus parallel stream processing.
Intermediate Java. Whereas my "Java 8 OCA (1Z0-808) Course" starts at the bning, this assumes that the learner has a reasonable level of Java.
To make understanding lambdas easier, a familiarity with anonymous inner classes would help. That said, lambdas are contrasted with anonymous inner class syntax in the course.
This course is a systematic approach to explaining in both notes format and code examples, lambda expressions and streams in Java.
Topics include:
Lambdas:
Functional Interfaces
Lambdas and their relationship to Functional Interfaces
Lambdas in code using a custom Functional Interface
Lambdas in code using the pre-defined API Functional Interfaces:
Predicate/BiPredicate
Supplier
Consumer/BiConsumer
Function/BiFunction
UnaryOperator and BinaryOperator
final and "effectively final"
Method References:
bound
unbound
static
constructor
context and it's effect in understanding method references
Streams:
Pipelines
Laziness
Creating streams
Teal operations:
reduce
collect
Collectors.toMap
Collectors.groupingBy
Collectors.partitioningBy
Intermediate operations:
filter, distinct, limit
map, flatMap, sorted
Primitive streams:
Creating
API
Functional Interfaces
Mapping between primitive streams
Mapping between primitive streams and Object streams and vice versa
Optionals
Parallel streams
This course is geared towards Java Certification i.e. the Predicate lambda sections would suit Java 8 OCA (1Z0-808). The remaining lambda sections and the streams sections would suit both Java 8 OCP (1Z0-809) and Java 11 (1Z0-819). This course explains the concepts through small, simple, targeted code examples. There are no MCQ's or code exercises to be done.
For those who don't know me, my "Java 8 OCA (1Z0-808) Course" is, at the of writing, the highest rated Java 8 OCA course on Udemy. I am a lecturer since 2002 and have taught the OCA and OCP syllabii since 2013 on behalf of a highly regarded software company. On completion of the courses with me, graduates then face the company's own internal Java Certification exam (similar in style to Oracle's). I have no visibility into the questions they will face. It is a 3 hour long intensive exam. The company are delighted with the pass rate (100% since year 1).
I love teaching and this course has all my experience in explaining lambdas and streams in Java. I am delighted that Enthuware (the excellent Java certification training tool), have, in their explanations, linked to my YouTube channel.
Anyone interested in learning Lambdas and Streams (the Functional Programming aspects of Java 8).






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