Java bytes to string helper

ByteStringer.java

import java.io.IOException;
import java.math.BigDecimal;
import java.math.RoundingMode;

public class ByteStringer {
  private static final String[] BYTES_UNITS = new String[] {"B", "KB", "MB", "GB", "TB"};

  public static double round(double value, int places) {
      if (places < 0) throw new IllegalArgumentException();

      BigDecimal bd = BigDecimal.valueOf(value);
      bd = bd.setScale(places, RoundingMode.HALF_UP);
      return bd.doubleValue();
  }

  private static String bytesToString(Long bytes) {
      double value = bytes;

      double DIVIDER = 1024.0;
      int unitIndex = 0;
      while (unitIndex < BYTES_UNITS.length - 1 && value > DIVIDER) {
          value = value / DIVIDER;
          ++unitIndex;
      }

      String number;
      double rounded = round(value, 2);
      int centides = (int) ((rounded % 1) * 100);
      if(centides != 0) {
          number = "" + rounded;
      } else {
          number = "" + (int) value;
      }
      return number + " " + BYTES_UNITS[Math.min(unitIndex, BYTES_UNITS.length - 1)];
  }
}