Author Archives: Stanislav_Panteleev

📘 What is FileFilter? It’s part of java.io. It’s a functional interface with one method: Used to filter files or directories based on your logic (e.g., extension, size, name pattern).

Here’s a categorized list of the most commonly used methods of the File class: 📁 File Creation & Deletion Method Description createNewFile() Creates a new empty file if it doesn’t exist delete() Deletes the file or directory deleteOnExit() Deletes file … Continue reading →

📁 java.io.File 🧠 What is File? It’s a class in the java.io package. It represents a file or directory path in an abstract, platform-independent way. It does not read/write file content itself — it provides metadata and file system operations.

in most real-world scenarios, buffering improves performance and is recommended: ✅ Reduces I/O system calls ✅ Speeds up character-by-character reading/writing ✅ Adds convenient methods: readLine(), newLine() That’s why BufferedReader and BufferedWriter are used in 90%+ of text-processing code.

🚀 Buffered I/O Classes in Java 🔹 1. BufferedInputStream Extends: FilterInputStream Buffers: Raw byte input Used with: InputStream

🔁 Classes that Convert Between Byte and Character Streams 🔹 1. InputStreamReader Converts: InputStream → Reader Direction: Byte → Character Use case: Reading a byte stream (e.g., from a file or network) as text. ✅ Example: Wraps an InputStream Decodes … Continue reading →

🔄 Commonalities Feature InputStream / OutputStream Reader / Writer Belong to java.io package java.io package Abstract classes Yes ✅ Yes ✅ Base for stream hierarchy Yes ✅ Yes ✅ Support chaining/wrapping Yes ✅ Yes ✅ (e.g., with buffering) Need to … Continue reading →

🆚 PrintWriter vs PrintStream Feature PrintWriter PrintStream Package java.io java.io Extends Writer (character-based) OutputStream (byte-based) Works with Character streams Byte streams Encoding-aware ✅ Yes (especially with OutputStreamWriter) ❌ No — uses platform default charset Methods print(), println(), printf(), write() print(), … Continue reading →

📘 Writer Overview Writer is an abstract class in java.io for writing character data. It’s the counterpart to OutputStream, but designed for writing text (characters and strings) rather than raw bytes.

The Reader class is part of Java’s character-based I/O system, introduced to handle text data (as opposed to InputStream which handles raw bytes). Let’s go over the key subclasses and their purposes.