File Handling

Programs:-

WriterExample.java

import java.io.FileWriter;

import java.io.IOException;

import java.io.Writer;

public class WriterExample {

                public static void main(String[] args) {

                                try {

                                                Writer w = new FileWriter(

                                                                                "D:\\practice java\\Filehandling IO\\files\\testout.txt");

                                                String content = "I love my country ";

                                                w.write(content);

                                                w.close();

                                                System.out.println("Done");

                                } catch (IOException e) {

                                                e.printStackTrace();

                                }

                }

}

//Path:- file create

//D:\\practice java\\Filehandling IO\\files\\testout.txt

o/p:-

Done

ReaderExample.java

import java.io.FileReader;

import java.io.Reader;

public class ReaderExample {

                public static void main(String[] args) {

                                try {

                                                Reader reader = new FileReader("D:\\practice java\\Filehandling IO\\files\\testout.txt");

                                                int data = reader.read();

                                                while (data != -1) {

                                                                System.out.print((char) data);

                                                                data = reader.read();

                                                }

                                                reader.close();

                                } catch (Exception ex) {

                                                System.out.println(ex.getMessage());

                                                /*

                                                 * if not found testoutput.txt (The system cannot find the file

                                                 * specified)

                                                 */

                                }

                }

}

o/p:-

I love my country

PrintWriterExample.java

import java.io.File;

import java.io.PrintWriter;

public class PrintWriterExample {

                public static void main(String[] args) throws Exception {

                                // Data to write on Console using PrintWriter

                                PrintWriter writer = new PrintWriter(System.out);

                                writer.write("Javatpoint provides tutorials of all technology.");

                                writer.flush();

                                writer.close();

                                // Data to write in File using PrintWriter

                                PrintWriter writer1 = null;

                                writer1 = new PrintWriter(new File("D:\\practice java\\Filehandling IO\\files\\testout1.txt"));

                                writer1.write("Like Java, Spring, Hibernate, Android, PHP etc.");

                                writer1.flush();

                                writer1.close();

                }

}

o/p:-

Javatpoint provides tutorials of all technology.

OutputStreamWriterExample.java

import java.io.FileOutputStream;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.Writer;

public class OutputStreamWriterExample {

                public static void main(String[] args) {

                                try {

                                                OutputStream outputStream = new FileOutputStream(

                                                                                "D:\\practice java\\Filehandling IO\\files\\testout2.txt");

                                                Writer outputStreamWriter = new OutputStreamWriter(outputStream);

                                                outputStreamWriter.write("Hello World");

                                                outputStreamWriter.close();

                                                System.out.println("Done");

                                } catch (Exception e) {

                                                e.getMessage();

                                }

                }

}

o/p:-

Done

FileReaderExample..java

import java.io.FileReader;

public class FileReaderExample {

     public static void main(String args[]) throws Exception {

           FileReader fr = new FileReader("D:\\practice java\\Filehandling IO\\files\\testout.txt");

           int i;

           while ((i = fr.read()) != -1)

                System.out.print((char) i);

           fr.close();

     }

}

o/p:-

I love my country

FileOutputStreamExample.java

import java.io.FileOutputStream;

public class FileOutputStreamExample {

     public static void main(String args[]) {

           try {

                FileOutputStream fout = new FileOutputStream(

                           "D:\\practice java\\Filehandling IO\\files\\testout.txt");

                fout.write(65);

                fout.close();

                System.out.println("success...");

           } catch (Exception e) {

                System.out.println(e);

           }

     }

}

o/p:-

success...

DataStreamExample.java

import java.io.FileInputStream;

public class DataStreamExample {

     public static void main(String args[]) {

           try {

                FileInputStream fin = new FileInputStream(

                           "D:\\practice java\\Filehandling IO\\files\\testout.txt");

                int i = fin.read();

                System.out.print((char) i);

                fin.close();

           } catch (Exception e) {

                System.out.println(e);

           }

     }

}

o/p:-

A

BufferedReaderExample.java

import java.io.BufferedReader;

import java.io.InputStreamReader;

public class BufferedReaderExample {

     public static void main(String args[]) throws Exception {

           InputStreamReader r = new InputStreamReader(System.in);

           BufferedReader br = new BufferedReader(r);

           String name = "";

           while (!name.equals("stop")) {

                System.out.println("Enter data: ");

                name = br.readLine();

                System.out.println("data is: " + name);

           }

           br.close();

           r.close();

     }

}

o/p:-

Enter data:

10

data is: 10

Enter data:

20

data is: 20

Enter data:

stop

data is: stop