Java Programming Basics with Examples

📘 File Reading in Java (Using FileReader Class) What is File Reading in Java? File Reading in Java is the process of reading data from a file stored on the system. Java provides the FileReader class (not “File Reading”) inside the java.io package to read character-based data from files. 📦 FileReader Class The FileReader class is used to read text data from a file character by character. 📌 Package java.io 🧱 Constructor of FileReader FileReader(String filePath) throws FileNotFoundException Opens a file located at the given file path. Internally creates an input stream to read data from the file. Throws FileNotFoundException if the file does not exist. 🛠️ Methods of FileReader Method.               Description int read().    Reads one character at a time and returns its ASCII (Unicode) value void close().   Closes the input stream and releases system resources 🔄 How File Reading Works (Step by Step) 1. Create a FileReader ob...

File Writing in Java What is File Writing? File Writing in Java is the process of writing data (text or characters) into a file stored on the system. Java provides the FileWriter class to perform file writing operations efficiently.   The FileWriter class is part of the java.io package and is mainly used to write character-based data into a file. FileWriter Class Package: java.io Purpose: Writes character data to a file Type: Character Output Stream FileWriter Constructor FileWriter(String filePath) throws IOException Explanation: filePath → Location where the file is created or written Throws IOException → Handles input/output errors 📌 If the file does not exist, Java creates a new file automatically. 📌 If the file exists, Java overwrites its content (unless append mode is used). FileWriter Methods Method.                                    Description write(String str).     ...