import java.io.*;
public class Copy{
 public static void copyFile(DataInputStream in,DataOutputStream out)throw IOException{
  try{
   while(true)
    out.writeByte(in.reaByte());
  }catch(EOFException eof){
   return;
  }
 }
 public static void main(String[] args){
  if (args.length !=2)
   System.out.println("Usage: java Copy sourceFile tarageFile");
  else{
   String inFileName = args[0],outFileName = args[1];
   File inFile = new File(inFileName);
   File outFile = new File(outFileName);
   if (!inFile.exists())
    System.out.println(inFileName+"does not exist.");
   else if(!outFile.exists())
    System.out.println(outFileName+"already exists");
   else{
    try{
     DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(new File(inFile))));
     DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(new File(outFile))));
     coyeFile(in,out);
     in.close();
     out.close();
    }catch(IOException e)
     {
      System.out.println("Unknown error:" + e);
     }
   }
  }
 }
}