Write a java programme to accept two file names as commandline arguments and copy containts of first to second in a manner that case of all alphabet is changed and digits are replaced by "*".Display appropriate error messages if first file does not exist.

Name :Shreyal Mandot

Title : Assignment 5a2. Write a java programme to accept two file names as commandline arguments and copy containts of first to second in a manner that case of all alphabet is changed and digits are replaced by "*".Display appropriate error messages if first file does not exist.



import java.io.*;

class ass5a2
{

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

File f1;

char ch;int i=0;
f1=new File(args[0]);

if( ! f1.exists())
{

System.out.println(args[0]+" Does not Exist ! \n Programme Terminated......... ");
System.exit(0);

}

FileInputStream f1i=new FileInputStream(args[0]);

FileOutputStream f2o=new FileOutputStream(args[1]);

    while(i != -1)
{

i=f1i.read();
   ch=(char)i;

  if(Character.isLetter(ch) )
{

if(!Character.isLowerCase(ch) )
{

ch=Character.toLowerCase(ch);
f2o.write(ch);

}

else
{

ch=Character.toUpperCase(ch);
f2o.write(ch);

}

  }

  if( Character.isDigit(ch) )
{

ch='*';
f2o.write(ch);

}

  }

f1i.close();f2o.close();

}

}