4) Copy contains one file to another file.

 

import java.io.*;

class filedemo1

{

public static void main(String as[])

{

System.out.println("file related program");

int n;

try

{

FileInputStream fis=new FileInputStream("input.txt");

FileOutputStream fos=new FileOutputStream("newdata.txt");

 

int c;

         while ((c = fis.read()) != -1) {

fos.write(c);

//            System.out.print((char)c+""); display on screen

}

}

catch(FileNotFoundException e )

{

System.out.println("error for file");

}

catch(IOException e )

{

System.out.println("error for io");

}

 

}

}

 

Input file:  input.txt

E:\sysem3>type input.txt

wel come to DBJ college

also to cs dept.

to  run use java filedemo1

Output:

 output file:  newdata.txt

E:\sysem3>type output.txt

wel come to DBJ college

also to cs dept.