Copy Paste File to File Java

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import java.io.*; 
class FileToFile
{
 public static void main(String args[])throws Exception
  {
   char x;
   FileInputStream ip=null;
   FileOutputStream op=null;

   ip=new FileInputStream("input.txt");
   op=new FileOutputStream("output.txt");
   x=(char)ip.read();
   while(x!='.')
   {
     op.write(x);
     x=(char)ip.read();
   }
   ip.close();
   op.close();
  } 
}

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