FileWriter

The FileWriter class in Java is used to write character-based data to files. It is part of the java.io package and is generally used for writing text files.

Basic Example

import java.io.FileWriter;
import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        try {
            FileWriter writer = new FileWriter("example.txt");
            writer.write("Hello, FileWriter!");
            writer.close();
            System.out.println("Successfully written to the file.");
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }
}

Appending to a File

Use the overloaded constructor with true to append data.

FileWriter writer = new FileWriter("example.txt", true);
writer.write("\nThis will be appended.");
writer.close();

Best Practices

  • Always close the FileWriter to free resources.
  • Wrap with BufferedWriter for efficient writing of large data.
  • Use try-with-resources to auto-close the stream.
try (FileWriter writer = new FileWriter("example.txt")) {
    writer.write("Auto-closed FileWriter.");
}

🔗 Related Notes