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, …

Java files, part 5: Writing and reading structured data: DataOutputStream, DataInputStream Read More »

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 …

Java files, part 4: Listing directory contents / Moving, copying, deleting files Read More »

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 …

Java files, part 3: Constructing file and directory names (with File, Path, and Paths) Read More »

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 …

Java files, part 2: How to write files quickly and easily Read More »

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 …

Java files, part 1: How to read files easily and fast Read More »

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 …

How to convert String to int in Java – peculiarities and pitfalls Read More »

In this article, I show you how to convert an int into a String in Java the fastest way. The answer is probably surprising for some. I present four variants and measure and compare their speed using JMH microbenchmarks. I analyze the measurement results looking at the Java source code and also the generated bytecode. …

How to convert int to String in Java – the fastest way Read More »