Reading from a File

import java.io.*;

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

Writing to a File

import java.io.*;

public class FileWriteExample {
    public static void main(String[] args) {
        try (BufferedWriter writer = new BufferedWriter(new FileWriter("output.txt"))) {
            writer.write("Hello, File I/O!");
            writer.newLine();
            writer.write("This is a new line.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}