FileHandlingActivity.java

    import java.io.*;
    import java.nio.file.Files;
    import java.nio.file.Path;
    import java.util.stream.Collectors;
    import java.util.stream.Stream;

public class FileHandlingActivity {
    public static void main(String[] args) {
        // Your code here
        
        // a. Create main directory
        File dir = new File("JavaFileSystem");
        dir.mkdir();
        // b. Create three text files
        try {
        File file = new File("JavaFileSystem/notes.txt");
        file.createNewFile();
        File file1 = new File("JavaFileSystem/data.txt");
        file1.createNewFile();
        File file2 = new File("JavaFileSystem/log.txt");
        file2.createNewFile();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        // c. Write messages to files
        try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("JavaFileSystem/notes.txt"))) {
            bufferedWriter.write("secret stuff by angus");
        } catch (IOException e) {
            e.printStackTrace();
        }

        try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("JavaFileSystem/data.txt"))) {
            bufferedWriter.write("encrypted message: #a*KIP)):+_}P");
        } catch (IOException e) {
            e.printStackTrace();
        }

        try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("JavaFileSystem/log.txt"))) {
            bufferedWriter.write("decrypted message: You Stink");
        } catch (IOException e) {
            e.printStackTrace();
        }
        // d. Read and display file contents
        StringBuilder content = new StringBuilder();
        try (BufferedReader br = new BufferedReader(new FileReader("JavaFileSystem/notes.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                content.append(line);
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        try (BufferedReader br = new BufferedReader(new FileReader("JavaFileSystem/data.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                content.append(line);
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        try (BufferedReader br = new BufferedReader(new FileReader("JavaFileSystem/log.txt"))) {
            String line;
            while ((line = br.readLine()) != null) {
                content.append(line);
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println(content.toString());
        // e. Create backup directory
        File subdir = new File("JavaFileSystem/Backup");
        subdir.mkdir();
        // f. Copy contents to backup file
        try{
        File backup = new File("JavaFileSystem/Backup/backup.txt");
        backup.createNewFile();}
        catch (IOException e) {
            e.printStackTrace();
        }
        try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("JavaFileSystem/Backup/backup.txt"))) {
            bufferedWriter.write(content.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
        // g. List all files in both directories
        File folder = new File ("JavaFileSystem");
        for (File file : folder.listFiles()){
            System.out.println(file.getName());
        }
        System.out.println();
        File folder1 = new File ("JavaFileSystem/Backup");
        for (File file : folder1.listFiles()){
            System.out.println(file.getName());
        }
        
    }
}