FileWriter and FileReader in java with example

FileWriter

FileWriter creates a writer that you can use  to write a file.



Use constructors:

1. FileWriter(String filepath)

       - It is create a new file and it get file name in string.

1. FileWriter(String filepath, boolean path)

       - It is create a new file and it get file name in file object.

For Example

/**

 *

 * @author pradeep

 */

import java.io.*;  

class FileWriterDemo

{  

 public static void main(String args[])

{  

  try

   {  

   FileWriter fw=new FileWriter("abc.txt");  

   fw.write("Hello pradeep");  

   fw.close();  

  }

        catch(Exception e){System.out.println(e);

 }  

  System.out.println("success");  

 }  

}  

Result: Output of this program is

run:
success

BUILD SUCCESSFUL (total time: 0 seconds)





FileReader

It is a class which is responsible for class creates a reader that you can use read the contents of a file.

It does the following task:

1. Connect to standard input console.
2. Converts the bytes string coming from the source into char stream.

Use constructors:

1. FileReader(String filepath)
2. FileReader(File fileobj)

For Example

/**

 *

 * @author pradeep

 */

import java.io.*;  

class FileReaderDemo

{  

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

{  

  FileReader fr=new FileReader("abc.txt");  

  int i;  

  while((i=fr.read())!=-1)  

  System.out.println("FileReader is:"+(char)i);  

  

  fr.close();  

 }  

}  

Result: Output of this program:

run:

FileReader is:H

FileReader is:e

FileReader is:l

FileReader is:l

FileReader is:o

FileReader is: 

FileReader is:p

FileReader is:r

FileReader is:a

FileReader is:d

FileReader is:e

FileReader is:e

FileReader is:p

BUILD SUCCESSFUL (total time: 0 seconds)