Write into file Example

import java.io.*;

class Bistream{
public static void main (String args[]){
try{
BufferedInputStream in =new BufferedInputStream(new FileInputStream("test.txt"));
int i,j=1;
while((i = in.read ())!= -1){
System.out.print((char)i);
if (j==10)
in.skip(10);
if (j==20)
in.mark(199); //mark at 20th byte so that we can come back
if(j==30)
in.reset();
j++;
}
in.close();
} catch (Exception e){};
}
}