Java Programming Tutorials

Java programming tutorials with many code examples!

Java 8 reduce by example

Java 8 reduce is a great method to compute a value from stream of values – reduce collection to value. In this post we’ll explain how reduce in Java work.

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Groovy for Java Developers

Groovy for Java Developers – essentials

In this tutorial you will learn the most common features of Groovy that will allow you to get up and running in just a few minutes!

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Java read XML using DOM

Java read XML using DOM

Java DOM API is comfortable to work with not big XML documents. They can be easily loaded and modified in runtime. In this post we show how to do it.

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Java create XML using DOM

Java create XML using DOM

Java allows to work with XML in many different ways. In this post we show how to use Java DOM API to create a document and write it as XML file.

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Java Reverse String in 2 ways

Java Reverse String in 2 ways

Java String doesn’t have reverse method, so it may not be immediately apparent how to reverse a string in Java. Here are two ways do do it.

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Java Util Optional map(Function)

java.util.Optional.map(Function)

The method Optional.map(Function) applies the given function to the optional value if it is present and returns an optional with the result or empty optional.

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