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Tag Archives: Java 8

Java 8: Sorting values in collections

Having realised that Java 8 is due for its GA release within the next few weeks I thought it was about time I had a look at it and over the last week have been reading Venkat Subramaniam’s book. I’m up to chapter 3 which covers sorting a collection of people. The Person class is defined roughly like so:   ...

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Java 8 Friday Goodies: Local Transaction Scope

At Data Geekery, we love Java. And as we’re really into jOOQ’s fluent API and query DSL, we’re absolutely thrilled about what Java 8 will bring to our ecosystem. We have blogged a couple of times about some nice Java 8 goodies, and now we feel it’s time to start a new blog series, the… Java 8 Friday Every Friday, ...

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Java 8: Group by with collections

In my continued reading of Venkat Subramaniam’s ‘Functional Programming in Java‘ I’ve reached the part of the book where the Stream#collect function is introduced. We want to take a collection of people, group them by age and return a map of (age -> people’s names) for which this comes in handy. To refresh, this is what the Person class looks ...

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Playing with Java 8 Lambdas in the JDT

I’ve been playing with the language a bit while tinkering with the Java 8 support under development by the Eclipse Java development tools (JDT) project. I’ll admit that I’m a little underwhelmed by lambdas in Java 8. This, of course, comes from an Old Dude Who Knows Smalltalk (and LISP/Scheme). Like any good Smalltalk curmudgeon, when I set about learning ...

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Java 8 news

The first release candidates of Java 8, b128 and Java 8 RC2 showed up on February, fixing a serious flaw in the new Comparator API, where its new thenComparing() method had an unnecessary type restriction. The thenComparing() method of java.util.Comparator does not require that type U extend java.lang.Comparable, since keyComparator is used to compare extracted key objects. Java 8 RC2 ...

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Java 8: Compiling Lambda Expressions in The New Nashorn JS Engine

In a recent post I took a look at how Java 8 and Scala implemented Lambda expressions. As we know Java 8 is not only introducing improvements to the javac compiler, It’s also introducing a new one altogether – Nashorn. This new engine is meant to replace Java’s existing JavaScript interpreter Rhino. This is supposed to bring the JVM to ...

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Java 8 Type Annotations

Lambda expressions are by far the most discussed and promoted feature of Java 8. While I agree that Lambdas are a large improvement I think that some other Java 8 feature go a bit short because of the Lambda hype. In this post I want to show a number of examples from another nice Java 8 feature: Type Annotations. Type ...

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Building and Running Java 8 Support

The Eclipse support for Java 8 is not yet available for download. If you want to play with it, you’ve got to build it. Eclipsepedia’s JDT Core/Java8 page includes instructions for setting up your development environment with the source for the evolving Java 8 support in the Eclipse Java development tools (JDT). There’s a few pieces missing from the instructions; ...

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Java 8 Friday Goodies: Lambdas and Sorting

At Data Geekery, we love Java. And as we’re really into jOOQ’s fluent API and query DSL, we’re absolutely thrilled about what Java 8 will bring to our ecosystem. We have blogged a couple of times about some nice Java 8 goodies, and now we feel it’s time to start a new blog series, the… Java 8 Friday Every Friday, ...

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