Home » Tag Archives: Java 8 (page 2)

Tag Archives: Java 8

How to FlatMap a JDBC ResultSet with Java 8?

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You’re not into the functional mood yet? Then the title might not resonate with you – but the article will! Trust me. Essentially, we want this: +------+------+------+ | col1 | col2 | col3 | +------+------+------+ | A | B | C | row 1 | D | E | F | row 2 | G | H | I | ...

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Java 8 Lambdas in One Line

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If you understand this line, or better still can write this code you can pretty much say that you have understood the essence of Java 8 Lambdas. Certainly in as much as they can be used with collections. I found this in a recent presentation by Peter Lawrey.  (Definitely worth watching the whole presentation when you have a spare hour.) Anyway ...

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How to Use Java 8 Streams to Swiftly Replace Elements in a List

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Imagine you have a list of items: List<String> books = Arrays.asList( "The Holy Cow: The Bovine Testament", "True Hip Hop", "Truth and Existence", "The Big Book of Green Design" ); (Don’t judge me. Books from this random book generator) Now you’d like to create a new list where the third item only is replaced by some new value: List<String> books ...

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Yet another Java 8 Lamdbas and Streams example

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I’ve been lagging behind with what Java 8 features exercising concerns, so in this post I will briefly present my initial experience with lambdas and streams. As usual, I will focus on a Podcast class:               package org.codingpedia.learning.java.core; import java.util.Comparator; public class Podcast { int id; String title; String producer; int subscriptionsNumber; /** number of ...

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Java 8 Lambda Expressions Tutorial

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Greetings! :) After a few months away I decided to come back in style :). I noticed that one of my previous posts about the new Date/Time API got really popular, so this time I’m going to dedicate this post to another new feature of Java 8: Lambda Expressions. Functional Programming Lambda Expressions are the way by which the Java ...

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JDK 8 Streams and Grouping

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I wrote about the powerful features of using JDK 8‘s Streams with Java collections in the post Stream-Powered Collections Functionality in JDK 8. I did not cover use of the groupingBy Collector reduction operation in that post and so address grouping in this post. The examples in this post will demonstrate how to combine Collection-backed Streams with groupingBy Collectors to ...

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Walking Recursive Data Structures Using Java 8 Streams

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The Streams API is a real gem in Java 8, and I keep finding more or less unexpected uses for them. I recently wrote about using them as ForkJoinPool facade. Here’s another interesting example: Walking recursive data structures. Without much ado, have a look at the code:             class Tree { private int value; private ...

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Mapreduce in Java8

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Wordcount is to Mapreduce what “Hello world” is for rest of the programming world. Recently I have been exploring some of the more prominent Java 8’s features like Lambda, Streams and Optionals, so I thought it’d be nice to do a simplified version of Wordcount in Java. Java’s Stream and Lambda functions makes it really easy and concise to implement ...

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Using Java 8 Lambda expressions in Java 7 or older

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I think nobody declines the usefulness of Lambda expressions, introduced by Java 8. However, many projects are stuck with Java 7 or even older versions. Upgrading can be time consuming and costly. If third party components are incompatible with Java 8 upgrading might not be possible at all. Besides that, the whole Android platform is stuck on Java 6 and ...

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