Module 17: File Handling

📂 What is File Handling?

File handling in Java allows programs to read and write data to files on the disk. Java provides the java.io and java.nio packages for this purpose.

📖 Reading a File using BufferedReader

                    import java.io.*;
                    
                    public class ReadFileExample {
                      public static void main(String[] args) throws IOException {
                        BufferedReader reader = new BufferedReader(new FileReader("sample.txt"));
                        String line;
                        while ((line = reader.readLine()) != null) {
                          System.out.println(line);
                        }
                        reader.close();
                      }
                    }
                    

✍️ Writing to a File using FileWriter

                    import java.io.*;
                    
                    public class WriteFileExample {
                      public static void main(String[] args) throws IOException {
                        FileWriter writer = new FileWriter("output.txt");
                        writer.write("Hello, this is Java file handling.");
                        writer.close();
                      }
                    }
                    

🛑 Handling Exceptions

Always handle IOExceptions when dealing with files to prevent program crashes.

                    try {
                      FileReader fr = new FileReader("test.txt");
                    } catch (FileNotFoundException e) {
                      System.out.println("File not found!");
                    }