Membaca dan Menulis Berkas

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class BacaBerkas {
    public static void main(String[] args) {
        try {
            FileInputStream fis = new FileInputStream("nama_file.txt");
            BufferedReader reader = new BufferedReader(new InputStreamReader(fis));

            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }

            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.BufferedWriter;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;

public class TulisBerkas {
    public static void main(String[] args) {
        try {
            FileOutputStream fos = new FileOutputStream("nama_file.txt");
            BufferedWriter writer = new BufferedWriter(new FileWriter(fos));

            String data = "Tulisan yang akan ditulis ke berkas.";

            writer.write(data);
            writer.newLine(); // Untuk menambahkan baris baru jika diperlukan.
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}