Java IO (Input/Output) Tutorial

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Java I/O (Input/Output) is used to process the input and produce the output. Java uses the concept of a stream to make I/O operations smooth. The java.io package contains all the classes required for input and output operations.

On this page, you will find all the Java input/output classes, examples, and tutorials.

The source code from this guide is bug-free and used JDK 8+ to compile and execute the source code.

Java I/O Basics

• Overview of Java I/O
• Java I/O Byte Streams
• Java I/O Character Streams
• Java I/O Buffered Streams
• Java I/O Object Streams
• Java I/O Data Streams

Java I/O Classes

Byte Streams

• FileOutputStream Class in Java
• FileInputStream class in Java
• ByteArrayOutputStream Class in Java
• ByteArrayInputStream Class in Java
• DataOutStream Class in Java
• DataInputStream Class in Java
• ObjectOutputStream Class in Java
• ObjectInputStream Class in Java
• BufferedOutputStream Class in Java
• BufferedInputStream Class in Java

Character Streams

• BufferedWriter Class in Java
• BufferedReader Class in Java
• FileWriter Class in Java
• FileReader Class in Java

File Handling Examples

• How to Create a New File in Java
• How to Write to File in Java
• How to delete a file in Java
• How to Copy the File in Java
• How to Move a File in Java
• How to Rename the File in Java 
• How to Append to File in Java
• Read the File using BufferReader
• Read File using BufferInputStream
• Read the File using DataInputStream
• Reading a File in Java using BufferedInputStream
  
• Read a File in Java using BufferedReader
  
• Java Get File Extension From Filename
• Get File Size in Bytes KB MB GB TB 
• How to Check if a File is Empty in Java
  
• Get the File's Last Modification Time in Java
  
• Get the Parent Directory of a File in Java
  
• How to Get File Size in Java
  
• How to Get File Creation Time in Java
  

File Serialization Examples

• How to write an Object to a file in Java
• How to Read an Object from a File

File Zip/Unzip and Compress/Decompress Examples

• Compress Files in ZIP format in Java
• Decompress Files from a ZIP file in Java
• Compressing and Decompressing Files in Java using GzipInputStream and GzipOutputStream
  
• Creating and Extracting Zip Archives in Java using ZipInputStream and ZipOutputStream
  

Directory Handling Examples

• How to Get the Current Working Directory in Java 
• How to Create a Directory in Java
• How to Delete a Directory in Java 
• How to Copy a Directory in Java
• List Files in Directory in Java - Example
• List Files in Directory and Subdirectories in Java
• How to Check If a Directory Is Empty in Java

File Utilities for Project Development

• Java File Utility Class
• Java Zip Utility Class 
• Top File Utility Methods

Java NIO Examples

• Java NIO Files Class API Guide
• Java File Size with Files.size()
• Java Create Directory with Files.createDirectory()
• Java Append to File with Files Class
• How to Get the Owner of a File in Java
• Java Files.write() Method Example
• Java Files.readAllLines() Method Example
• Java Move or Rename File with Files.move() Method Example
• Java Delete File with Files.deleteIfExists() Method Example
• Java Copy File with Files.copy() Method Example
• Java Create File with Files.createFile() Method Example

Java I/O References

• https://docs.oracle.com/javase/tutorial/essential/io/index.html
• https://docs.oracle.com/javase/8/docs/api/java/io/package-tree.html

GitHub Repository

• https://github.com/RameshMF/java-io-guide