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Guide to Java FileChannel 1. Overview In this quick tutorial, we’ll look at the FileChannel class provided in the Java NIO library. We’ll discuss how to read and write data using FileChannel and ByteBuffer. We’ll also explore the advantages of using FileChannel and some of its other file manipulation features.… Continue Reading java-filechannel

Java – Byte Array to Reader In this quick tutorial, we’re going to convert a simple byte array to a Reader using plain Java, Guava and finally the Apache Commons IO library. This article is part of the “Java – Back to Basic” series here on Baeldung. 1. With Plain… Continue Reading java-convert-byte-array-to-reader

Java – Byte Array to Writer 1. Overview In this very quick tutorial, we’ll discuss how to convert byte[] to Writer using plain Java, Guava and Commons IO. 2. With Plain Java Let’s start with a simple Java solution: @Test public void givenPlainJava_whenConvertingByteArrayIntoWriter_thenCorrect() throws IOException { byte[] initialArray = “With… Continue Reading java-convert-byte-array-to-writer

Java – Read from File 1. Overview In this tutorial we’ll explore different ways to read from a File in Java; we’ll make use of BufferedReader, Scanner, StreamTokenizer, DataInputStream, SequenceInputStream and FileChannel. Then, we will discuss how to read a UTF-8 encoded file and how to create String from contents… Continue Reading java-read-file

Java – Write to File 1. Overview In this tutorial we’ll explore different ways to write to a file using Java. We’ll make use of BufferedWriter, PrintWriter, FileOutputStream, DataOutputStream, RandomAccessFile, FileChannel and the Java 7 Files utility class. We’ll also take a look at locking the file while writing and… Continue Reading java-write-to-file

List Files in a Directory in Java 1. Overview In this quick tutorial, we’ll look into different ways to list files within a directory. 2. Listing If we want to list all the files in the directory and skip further digging into sub-directories, we can simply use java.io.File#listFiles: public Set<String>… Continue Reading java-list-directory-files

Delete the Contents of a File in Java 1. Introduction In this tutorial, we’ll see how we use Java to delete the contents of a file without deleting the file itself. Since there are many simple ways to do it, let’s explore each one by one. 2. Using PrintWriter Java’s PrintWriter… Continue Reading java-delete-file-contents