BufferedWriter: This is a wrapper over the Writer class, which also supports buffering capabilities.FileWriter: A class to actually write characters to the file.OutputStreamWriter: This class is used to write character streams and also convert them to byte streams.Writer: This is an abstract class to write the character streams.In many cases this is most preferable class to read data because more data can been read from the file in one read() call, reducing the number of actual I/O operations with file system.Īnd here are some classes you can use to write character data to a file: BufferedReader: This is a wrapper over the Reader class that supports buffering capabilities.FileReader: A class to read the characters from a file.InputStreamReader: Class used to read the byte stream and converts to character stream.Reader: An abstract class to read a character stream.Here are some classes you should know that can be used to read character data: All of these classes are defined under java.io package. Let's look at the most commonly used classes. Character StreamsĬharacter Streams are used to read or write the characters data type. There are two types of Streams you can use to interact with files:įor each of the above stream types, there are several supporting classes shipped with Java, which we'll take a quick look at below. In the following sections we'll provide a brief overview of the Java I/O classes and explain what they do, then we'll take a look at Java NIO Streams, and finally we'll show some examples of reading and writing data to files. With subsequent releases, Java I/O has been improved, simplified and enhanced to support new features.īefore we get in to some actual examples, it would help to understand the classes available to you that will handle the reading and writing of data to files. Java provides several API (also known as Java I/O) to read and write files since its initial releases. In this tutorial, we are going to show the most common ways you can read and write to files in Java. This data could be cache data, data you retrieved for a dataset, an image, or just about anything else you can think of. ![]() When programming, whether you're creating a mobile app, a web application, or just writing scripts, you often have the need to read or write data to a file. In this article, we'll be diving into Reading and Writing Files in Java.
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