Java – How-Tos and Tutorials

On this page, you find an overview of how-tos and tutorials about Java.

Project Amber – Java Syntax Enhancements

In Project Amber, new Java language features are being developed such as switch expressions, text blocks, records, pattern matching, and sealed classes.

Java Text Blocks Read more »

Sealed Classes in Java Read more »

Java Records Read more »

New Java Features

Every new Java release brings big and small changes:

Changes to the language itself (lambdas, the module system, var, improvements from Project Amber, ...),
API enhancements and
Performance improvements under the hood.

In addition, legacy features are regularly marked as "deprecated", then as "deprecated for removal", and later completely removed from the JDK.

In this series of articles, you will learn everything about the most important changes in each Java release.

Java 18 Features (with Examples) Read more »

Java 17 Features (with Examples) Read more »

Java 16 Features (with Examples) Read more »

Java 15 Features (with Examples) Read more »

Java 14 Features (with Examples) Read more »

Java 13 Features (with Examples) Read more »

Java 12 Features (with Examples) Read more »

Java 11 Features (with Examples) Read more »

Java 10 Features (with Examples) Read more »

Java Algorithms and Data Structures

This category covers algorithms, such as sorting, search and hash functions, as well as data structures, such as collections, maps and sets, trees, queues, deques, and stacks – both in general and their Java implementations.

Comparator, Comparable und compareTo – Vergleichen von Objekten in Java - Feature-Bild

Comparator, Comparable, compareTo – Comparing Java Objects Read more »

Queue, Deque and Stack in Java Ultimate Guide - feature image

Java Queue, Deque, and Stack: Ultimate Guide Read more »

Advanced Java Topics for Experts

This section covers advanced Java topics such as reflection, concurrency, garbage collection, and the Java memory model.

Java - How to Hack Integer and String With Deep Reflection - feature image

Deep Reflection: How to Hack Integer and String (Advanced Java) Read more »

ByteBuffer How to use flip() and compact() - Feature image

Java ByteBuffer: How to Use flip() and compact() Read more »

Article series "Files in Java"

Files

in Java

What you'll learn

How to read and write text and binary files
Character encoding and line breaks
Constructing relative and absolute file and directory names with File, Path, and Paths
How to list all files of a directory, how to search files
How to move, rename, copy and delete files
Saving complex objects and primitive data types in binary files
Writing and reading files with FileChannel and ByteBuffer

6 Articles

Start now

Java Performance

This category deals with the performance of Java code, i.e., with which Java means a particular task can be executed most efficiently - possibly depending on the Java version. Not only is it important to know how to optimize code, but also when it is better to leave the optimization to the Java Runtime and the Hotspot Compiler.

How to convert String to int in Java - feature image

How to Convert String to Int in Java – Peculiarities and Pitfalls Read more »

Convert int to String Java fastest method - feature image

How to Convert int to String in Java – The Fastest Way Read more »

Java Productivity

This section covers topics related to development productivity, i.e., how to develop clean, professional, and maintainable Java code faster and more efficiently.