Java – How-Tos and Tutorials

As a Java programmer, I work on various projects based on different Java versions, especially since the transition to the six-month release cycle. From time to time, I also have a piece of Java code that I want to try out on different Java versions – on the command line without having to click through …

I am currently reading the book “The Pragmatic Programmer” by Andrew Hunt and David Thomas. In this book, the authors give the following task: Which of these “impossible” things can happen? […]3. In C++: a = 2; b = 3; if (a + b != 5) exit(1); […] One of the correct answers is 3. …

In this article, I show you, using an example, how the Java ByteBuffer works, and what precisely the Methoden flip() and compact() do. The article answers the following questions: What is a ByteBuffer, and what do you need it for? How do you create a ByteBuffer? What do the values position, limit, and capacity mean? …

The previous five parts of this article series covered reading and writing files, directory and file path construction, directory and file operations, and writing and reading structured data. In today’s part, I explain the NIO classes FileChannel and ByteBuffer introduced in Java 1.4 with JSR 51 (“New I/O APIs for the JavaTM Platform”). Moreover, I …

In the first four parts of this article series, we covered reading and writing files, directory and file path construction, and directory and file operations. Up to now, we have only read and written byte arrays and Strings. In this fifth part, you will learn how to write and read structured data with DataOutputStream, DataInputStream, …

Previous articles in this series have covered reading files with Java, writing files, and constructing directory and file paths with the File and Path classes. This fourth part describes the most important directory and file operations. It answers the following questions: How to list all files in a directory? How to search for files matching …

After covering file reading and writing operations in Java, this third part of the series of articles deals with how to use the classes File, Path, and Paths to construct file and directory paths – regardless of the operating system. If you have already dealt with file operations in Java, you have probably used these …

After the first part of the series was about reading files in Java, this second part introduces the corresponding methods for writing small and large files. The article addresses the following questions in detail: What is the easiest way to write a string or a list of strings to a text file? How to write …

The packages java.io and java.nio.file contain numerous classes for reading and writing files in Java. Since the introduction of the Java NIO.2 (New I/O) File API, it is easy to get lost – not only as a beginner. Since then, you can perform many file operations in several ways. This article series starts by introducing …

In the previous article, I showed you that “” + i is the fastest way to convert an int into a String in Java. All the way from Java 7 to Java 14. Today you will learn what to consider in the opposite direction, i.e., when parsing a String to an int. You can find …