FileInputStream and FileOutputStream

[Rohit Rane]

import java.io.*;
class output
{
public static void main(String args[])throws Exception
{
try
{
FileInputStream fis=new FileInputStream("D:/R R/New Folder2/unit3/b.txt");
FileOutputStream fos=new FileOutputStream("D:/R R/New Folder2/unit3/a.txt");
int d;
while((d=fis.read())!=-1)
{
fos.write(d);
}
fis.close();
FileInputStream fis1=new FileInputStream("D:/R R/New Folder2/unit3/b.txt");
while((d=fis1.read())!=-1)
{
System.out.print((char)d);
}
fis1.close();
fos.close();
}
catch(FileNotFoundException e)
{
System.out.println(e);
}
}
}
hey any one can explain me this code

[sumitgoyal76]

this program is used to write in a file but i dont know why file's name is different for output stream and input stream it should be same it is a.txt fot output stream and b.txt for input
is this program working fine ?

[Rohit Rane]

program does not work fine . Nothing display's on cmd.
also i done using same file name for input stream and output stream