Home » Tag Archives: Java 8 (page 5)

Tag Archives: Java 8

Using Java 8 CompletableFuture and Rx-Java Observable

I wanted to explore a simple scatter-gather scenario using Java 8 CompletableFuture and using Rx-Java Observable. The scenario is simple – Spawn about 10 tasks, each returning a string, and ultimately collect the results into a list. Sequential A sequential version of this would be the following: public void testSequentialScatterGather() throws Exception { List<String> list = IntStream.range(0, 10) .boxed() .map(this::generateTask) ...

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Java SE 8 new features tour: Processing Collections with Streams API

Cleaner, readable, and powerful coding with Java SE 8 Streams….. In this article of the “Java SE 8 new features tour” series, we will deep dig into explanation, and exploring the code, on how to traversing collections with streams Creating streams from collections and arrays, Aggregating stream values. In the previous article “Traversing, filtering, processing collection, & methods enhancements with ...

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Java performance tutorial – How fast are the Java 8 streams?

In this JAX Magazine sneak preview, JAX London speaker Angelika Langer answers the most important question for anyone using Java streams: are they really faster? Java 8 came with a major addition to the JDK collection framework, namely the stream API. Similar to collections, streams represent sequences of elements. Collections support operations such as add(), remove(), and contains() that work ...

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Casting In Java 8 (And Beyond?)

Casting an instance to a type reeks of bad design. Still, there are situations where there is no other choice. The ability to do this has hence been part of Java since day one. I think Java 8 created a need to slightly improve this ancient technique. Static Casting The most common way to cast in Java is as follows: ...

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Functional Programming in Java 8 with Javaslang

We’re very happy to announce a guest post on the jOOQ Blog written by Daniel Dietrich, Senior Software Engineer at HSH Nordbank, husband and father of three. He currently creates a pricing framework for financial products as project lead and lead developer. Besides his work, he is interested in programming languages, efficient algorithms and data structures. Daniel wrote the short ...

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Cheating with Exceptions – Java 8 Lambdas

Cheating with Exceptions – Java 8 Lambdas Leaving aside the religious debate about Checked vs Runtime exceptions, there are times where due to poorly constructed libraries, dealing with checked examples can drive you insane. Consider this snippet of code which you might want to write: public void createTempFileForKey(String key) { Map<String, File> tempFiles = new ConcurrentHashMap<>(); //does not compile because ...

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JUnit: Testing Exceptions with Java 8 and AssertJ 3.0.0

AssertJ 3.0.0 release for Java 8 makes testing exceptions much easier than before. In one of my previous blog post I described how to utilize plain Java 8 to achieve this, but with AssertJ 3.0.0 much of the code I created may be removed. Warning: this blog post contains mostly the code examples.     SUT – System Under Test ...

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Using Rhino with Java 8

Java brings Nashorn as new JavaScript implementation for JSR 223 (javax.scripting). While this is certainly great news (Nashorn is way faster than Rhino by directly generating Java code), it comes with some challenges: Nashorn is not 100% compatible with Rhino. Rhino had some extensions and more or less other interpretations on how to combine the Java world with JavaScript. Therefore ...

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