FileReader

The FileReader class in Java is used to read character-based data from files. It is part of the java.io package and is ideal for reading text files.

Basic Example

import java.io.FileReader;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        try {
            FileReader reader = new FileReader("example.txt");
            int character;
            while ((character = reader.read()) != -1) {
                System.out.print((char) character);
            }
            reader.close();
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }
}

Best Practices

  • Always close the FileReader to avoid memory leaks.
  • Wrap with BufferedReader for efficient reading of large files.
  • Use try-with-resources for automatic closing.
import java.io.*;

public class Main {
    public static void main(String[] args) {
        try (BufferedReader br = new BufferedReader(new FileReader("example.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

🔗 Related Notes