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Mastering Java I/O: A Comprehensive Tutorial with Examples

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  • Post last modified:February 4, 2024


Java I/O (Input/Output) is a crucial aspect of programming, enabling the handling of data streams, files, and other external sources. The package provides a versatile set of classes and interfaces for performing I/O operations. In this tutorial, we will explore the basics of Java I/O, covering common scenarios and providing examples to illustrate key concepts.

1. Reading and Writing to the Console:

Let’s start with basic console I/O using and System.out.

Example 1.1: Reading from the Console:

Example 1.2: Writing to the Console:

2. Reading and Writing Files:

Now, let’s move on to file I/O operations using FileInputStream, FileOutputStream, BufferedReader, and BufferedWriter.

Example 2.1: Reading from a File:

Example 2.2: Writing to a File:

3. Working with Binary Data:

Binary I/O is common when dealing with images, videos, or any non-textual data.

Example 3.1: Reading Binary Data:

Example 3.2: Writing Binary Data:


Java I/O provides a versatile set of tools for handling different types of data streams and performing input/output operations. From basic console interactions to reading and writing files, mastering Java I/O is essential for building robust and versatile applications. These examples cover fundamental aspects of Java I/O, and as you delve deeper into the topic, you’ll discover more advanced features and use cases.

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