Java Lambdas and Streams

Java Lambdas and Streams. Mastering Lambdas and Streams in Java (with code examples). Functional Interfaces – what they are and their relationship to lambda expressions.

What you’ll learn

• Functional Interfaces – what they are and their relationship to lambda expressions.
• 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 – Terminal operations.
• Streams – Terminal 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.

Requirements

• Intermediate Java. Whereas my “Java 8 OCA (1Z0-808) Course” starts at the beginning, 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.

Java Lambdas and Streams Course Description

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
  • Terminal 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 time 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.

Who this course is for:

• Anyone interested in learning Lambdas and Streams (the Functional Programming aspects of Java 8).

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