Revealing the essence of Java file operations: from basics to mastery

• Text file: Contains ASCII or Unicode characters and can be used as source code, documentation, or log file.
• Binary files: Contain non-text data such as images, audio, or executable code.

php editor Apple takes you to explore the essence of Java file operations, from basics to proficiency. File operations are a basic and important part of Java programming. Mastering file reading, writing, copying, deletion and other operating skills is crucial for developers. This article will systematically introduce the core knowledge of Java file operations to help readers gradually improve their skills, gain an in-depth understanding of the principles and applications of file operations, and achieve flexible control of file operations. Let us master the secrets of Java file operations and improve our programming skills!

File stream is a data channel that connects programs and files. Java provides two main types of streams:

• Byte stream: Processes raw bytes, suitable for binary files.
• Character stream: Process text in character units, suitable for text files.

File reading and writing

Read file:

• FileInputStream (byte stream) or FileReader (character stream): Open the file for reading mode.
• read() or readLine() Method: Read bytes or characters from a file.

Write to file:

• FileOutputStream (byte stream) or FileWriter (character stream): Open the file for writing mode.
• write() or println() Method: Write bytes or characters to the file.

File creation and deletion

• File Class: Represents a file or directory.
• createNewFile() Method: Create a new file.
• delete() Method: Delete the file.

Directory operations

• File Class: It can also represent a directory.
• list() or listFiles() Method: Get the list of files in the directory.
• mkdir() Method: Create a directory.

File path and absolute path

• File path: Specify the location of the file relative to the current directory.
• Absolute path: Specify the full path in the file system.

buffer

Buffering is a mechanism for temporarily storing data to improve the performance of file operations.

• Buffered input stream: BufferedReader (character stream) or BufferedInputStream (byte stream).
• Buffered output stream: BufferedWriter (character stream) or BufferedOutputStream (byte stream).

Exception handling

File operations may throw exceptions, such as file not found, insufficient permissions, or insufficient disk space. Use a try-catch block or a throws statement to handle exceptions.

Best Practices

• Use Automatic Resource Management (ARM) or finally blocks to ensure the file is closed after the operation.
• Check file permissions before file operations.
• Consider using buffering to improve performance.
• Handle exceptions carefully and provide useful error messages.

Extended function library

Java NIO 2 (New I/O 2) library provides more advanced file operation functions, including:

• Channel (Channel): Provides more efficient file access.
• FileLock (FileLock): used to synchronize file access.
• File Attributes (FileAttributeView): Used to read and set file attributes.

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