Java File Handling Programs

// Importing File Class
import java.io.File;

class Geeks 
{
    public static void main(String[] args)
    {
        // File name specified
        File obj = new File("myfile.txt");
        System.out.println("File Created!");
    }
}

// Creating File using Java Program

// Import the File class
import java.io.File;
import java.io.IOException;

public class CreateFile
{
    public static void main(String[] args)
    {
          // Creating the File also
          // Handling Exception
        try {
            File Obj = new File("myfile.txt");

              // Creating File
              if (Obj.createNewFile()) {
                System.out.println("File created: " + Obj.getName());
            }
            else {
                System.out.println("File already exists.");
            }
        }

          // Exception Thrown
        catch (IOException e) {
            System.out.println("An error has occurred.");
            e.printStackTrace();
        }
    }
}

// Writing Files using Java Program

// Import the FileWriter class
import java.io.FileWriter;
import java.io.IOException; 

public class WriteFile 
{
    public static void main(String[] args)
    {
        // Writing Text File also
        // Exception Handling
        try {

            FileWriter Writer = new FileWriter("myfile.txt");

            // Writing File
            Writer.write("Files in Java are seriously good!!");
            Writer.close();

            System.out.println("Successfully written.");
        }

        // Exception Thrown
        catch (IOException e) {
            System.out.println("An error has occurred.");
            e.printStackTrace();
        }
    }
}

// Reading File using Java Program

// Import the File class
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner; 

public class ReadFile 
{
    public static void main(String[] args)
    {
        // Reading File also
        // Handling Exception
        try {
            File Obj = new File("myfile.txt");
            Scanner Reader = new Scanner(Obj);

            // Traversing File Data
              while (Reader.hasNextLine()) {
                String data = Reader.nextLine();
                System.out.println(data);
            }

            Reader.close();
        }

        // Exception Cases
        catch (FileNotFoundException e) {
            System.out.println("An error has occurred.");
            e.printStackTrace();
        }
    }
}

// Deleting File using Java Program
import java.io.File; 

public class DeleteFile 
{
    public static void main(String[] args)
    {
        File Obj = new File("myfile.txt");

        // Deleting File
        if (Obj.delete()) {
            System.out.println("The deleted file is : " + Obj.getName());
        }
        else {
            System.out.println(
                "Failed in deleting the file.");
        }
    }
}

package pratice;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class iofile {
    public static void main(String[] args) throws IOException {
        // Specify the directory path
        File directory = new File("/home/neelakandan/Downloads/neel/subfolder");

        // Create the directory and subfolder if they don't exist
        boolean created = directory.mkdirs();
        if (created) {
            System.out.println("Directory and subfolder created successfully.");
        } else {
            System.out.println("Directory and subfolder already exist.");
        }

        File note = new File(directory, "note.txt");
        boolean fileCreated = note.createNewFile();
        if (fileCreated) {
            System.out.println("File created successfully.");
        } else {
            System.out.println("File already exists.");
        }

        // Writing to the file
        try (FileWriter pen = new FileWriter(note); BufferedWriter bPen = new BufferedWriter(pen)) {

            bPen.write("The story of Dragon movie starts from School Culturals");
            bPen.newLine();
            bPen.write("In the next scene, Principal gives talk.");
            bPen.flush(); // Ensures data is written to the file
        } catch (IOException e) {
            e.printStackTrace();
        }

        // Reading from the file
        try (FileReader reader = new FileReader(note)) {
            int no_of_space = 1; // Count spaces (approx words)
            int no_of_sentences = 0; // Count sentences based on period
            int no = reader.read();

            while (no != -1) {
                System.out.print((char) no);
                if ((char) no == ' ')
                    no_of_space++;
                if ((char) no == '.')
                    no_of_sentences++;
                no = reader.read(); // Read the next character
            }

            System.out.println();
            System.out.println("Spaces in the file: " + no_of_space); // Count spaces (approx words)
            System.out.println("Sentences in the file: " + no_of_sentences); // Count sentences
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}