FileHandlingActivity.java

import java.io.*;


public class FileHandlingActivity {
    public static void main(String[] args) throws IOException {
        // Your code here

        // a. Create main directory
        File directory = new File("JavaFileSystem");
        directory.mkdir();

        // b. Create three text files
        File note = new File(directory, "notes.txt");
        note.createNewFile();

        File data = new File(directory, "data.txt");
        data.createNewFile();

        File log = new File(directory, "log.txt");
        log.createNewFile();

        // c. Write messages to files

        FileWriter writer = new FileWriter(note);
        writer.write("Here is my special note.");
        writer.close();

        FileWriter writer2 = new FileWriter(data);
        writer2.write("Here is my second special note");
        writer2.close();

        FileWriter writer3 = new FileWriter(log);
        writer3.write("Here is my third special note");
        writer3.close();

        // d. Read and display file contents
        readContent(note);
        readContent(data);
        readContent(log);

        // e. Create backup directory
        File backupDir = new File(directory, "Backup");
        backupDir.mkdir();


        // f. Copy contents to backup file
        File backupF = new File(backupDir, "backup.txt");

        try (FileWriter fw = new FileWriter(backupF);
            BufferedWriter bw = new BufferedWriter(fw)) {
                copyFile(note, bw);
                copyFile(data, bw);
                copyFile(log, bw);
        }


        // g. List all files in both directories
        listFiles(directory);
        listFiles(backupDir);

        // Activity 3
        // calling debugfile
        debugFileOperation();
    }
    
    public static void readContent(File file) throws FileNotFoundException, IOException {
        try (FileReader fr = new FileReader(file);
            BufferedReader br = new BufferedReader(fr)) {
            System.out.println("Contents of " + file.getName());
            String line = br.readLine();
            while (line != null) {
                System.out.println(line);
                line = br.readLine();
            }
        }
    }
    
    public static void copyFile(File old, BufferedWriter bw) throws IOException {
        try (FileReader fr = new FileReader(old);
                BufferedReader br = new BufferedReader(fr)) {
            bw.write("..." + old.getName() + "...\n");
            String line = br.readLine();
            while (line != null) {
                bw.write(line);
                bw.newLine();
                line = br.readLine();
            }
        }

    }
    
    public static void listFiles(File dir) {
        System.out.println("Files in " + dir);
        File[] files = dir.listFiles();
        if (files != null) {
            for (File f : files) {
                System.out.println(f.getName());
            }
        }
        System.out.println();
    }



    public static void debugFileOperation() {
        try {
    // Fixed: creating file inside JavaFileSystem directory
        File file = new File("JavaFileSystem/fileName.txt");
    
    // Attempting to write to the invalid file
    FileWriter writer = new FileWriter(file);
    writer.write("Will this fail?");
    writer.close();
} catch (IOException e) {
    System.out.println("An error occurred: " + e.getMessage());
    e.printStackTrace(); 
}
    }


    


}