Java Lambdas and Streams

Java Lambdas and Streams

UPDATE June 2022 - I have just published my Java SE 11 Developer (1Z0-819): Java 11 OCP course. Lambdas and Streams are contained in that much larger course. Please check out the new course as it may be much better value.

UPDATE April 2022 - lambdas/method references assignment added!

This course is a systematic approach to explaining in both notes format and code examples, lambda expressions and streams in Java. All the code samples are included.

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.

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.

Mastering Lambdas and Streams in Java (with code examples)

Url: View Details

What you will 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

Rating: 4.55

Level: Intermediate Level

Duration: 3 hours

Instructor: Dr. Seán Kennedy OCA, OCP