How do I get rid of leading zeros.....

Question

Hello...
Here's what I am trying to do....
1. I get a file like below
00000000000.00 00000000000.00 00000036092.80
00000000000.00 00000000000.00 00000000240.00
and more lines depending on the how big the files are(possibly to have 1 million records)....
All I am trying to do here is getting rid of the leading zeros in record like below(they are amount of dollars)....
0.00 0.00 36092.80
0.00 0.00 240.00
What would be the best way to do this, assuming it will not clog the system.
Thanks,
Jay

Answer 1

import java.io.*;
import java.util.regex.*;
import java.util.*;
public class Example
   public static void main(String [] args)
      String line1 =
         "00000000000.43 00000000000.00 00000036092.80";
      List list = Collections.nCopies(1000000, line1);
      long time = getRidOfZero(list);
      System.out.println(time);
   public static long getRidOfZero(List lines)
      // This regex matches a bunch of 0's and then a decimal number.
      // It requires at least one digit before the decimal; this takes care
      // of 0.00 and handles the normal cases like 00243.06.
      String regex = "0*(\\d+?\\.\\d+)";
      Pattern p = Pattern.compile(regex);
      Matcher m = p.matcher("");
      long elapsedTime = 0;
      String line;
      long start = System.currentTimeMillis();
      for (Iterator i = lines.iterator(); i.hasNext(); )
         line = i.next().toString();
         m.reset(line);
         line = m.replaceAll("$1");
      long end = System.currentTimeMillis();
      m.reset();
      String rep = m.replaceAll("$1");
      System.out.println(rep);
      return end - start;
}