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Tag Archives: Java 8

Optional and Objects: Null Pointer Saviours!

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No one loves Null Pointer Exceptions ! Is there a way we can get rid of them ? Maybe . . .                    Couple of techniques have been discussed in this post: Optional type (new in Java 8) Objects class (old Java 7 stuff !) Optional type in Java 8 What is it? A ...

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Asynchronous SQL Execution with jOOQ and Java 8’s CompletableFuture

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Reactive programming is the new buzzword, which essentially just means asynchronous programming or messaging. Fact is that functional syntax greatly helps with structuring asynchronous execution chains, and today, we’ll see how we can do this in Java 8 using jOOQ and the new CompletableFuture API. In fact, things are quite simple:       // Initiate an asynchronous call chain ...

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How Nashorn Impacts API Evolution on a New Level

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Following our previous article about how to use jOOQ with Java 8 and Nashorn, one of our users discovered a flaw in using the jOOQ API as discussed here on the user group. In essence, the flaw can be summarised like so:               Java code package org.jooq.nashorn.test; public class API { public static void ...

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When the Java 8 Streams API is not Enough

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Java 8 was – as always – a release of compromises and backwards-compatibility. A release where the JSR-335 expert group might not have agreed upon scope or feasibility of certain features with some of the audience. See some concrete explanations by Brian Goetz about why … … “final” is not allowed in Java 8 default methods … “synchronized” is not ...

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Date/Time Formatting/Parsing, Java 8 Style

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Since nearly the beginning of Java, Java developers have worked with dates and times via the java.util.Date class (since JDK 1.0) and then the java.util.Calendar class (since JDK 1.1). During this time, hundreds of thousands (or maybe millions) of Java developers have formatted and parsed Java dates and times using java.text.DateFormat and java.text.SimpleDateFormat. Given how frequently this has been done ...

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Java 8 : Functional VS Traditional

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The business logic is the same : Given a String expression composed of visits / time like : “1/24h,1..3/3h,5/*” Then the result should be the following list of Strings: “1/24h”, “1/3h”,”2/3h”,”3/3h”, “5/1h”,”5/2h”,”5/3h”,”5/4h”,”5/5h”,until ,”24/1h” So, 2 things need to be solved, the dots and the stars for the visits and for the time. I will use Java 8 , but  I’ll ...

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Java yield-like using Stream API

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Several programming languages, such as Ruby or Python to name a few, provides the yield command. Yield provides an effective way, in terms of memory consumption, to create series of values, by generating such values on demand. More information on Python Yield. Let’s consider a class or method requiring a huge amount of secure random integers. The classical approach would ...

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Default Methods: Java 8’s Unsung Heros

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A few weeks ago I wrote a blog saying that developers learn new languages because they’re cool. I still stand by this assertion because the thing about Java 8 is it’s really cool. Whilst the undoubted star of the show is the addition of Lambdas and the promotion of functions to first class variables, my current favourite is default methods. ...

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Testing code for excessively large inputs

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When writing unit tests we mostly focus on business correctness. We do our best to exercise happy path and all edge cases. We sometimes microbenchmark and measure throughput. But one aspect that is often missed is how our code behaves when the input is excessively large? We test how we handle normal input files, malformed files, empty files, missing files… ...

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