The following examples provide the commonly used functions Java I/O provides. They have been fully tested and can be used directly.

• I/O Class Hierarchy Diagram
• Create file/directory
• Delete file
• Read file line by line
• Write to file
• Append to file
• Copy file
• Merge files into one file
• Move file
• Merge two directories
• Loop through directory
• Sort content in file
• Download Image from URL in Java
• Unzip a jar file
• FileOutputStream vs FileWriter
• When to close FileWriter?
• Convert file to string
• Convert file to char array
• Transfer content from one file to another
• Java: convert a file to a byte array, then convert byte array to a file.
• Java: convert image to byte array, convert byte array to image