How to @Override Comparator to make the Column in CellTable sort based on Integer not based on String (GWT)?

Ok, I got a Table with a list of No.

No  1  2  5  10  20  

If i set columnSortHandler for the No column using String like this:

columnSortHandler.setComparator(noColumn, new Comparator<String[]>() {          @Override          public int compare(String[] o1, String[] o2) {              if (o1==o2) {                    return 0;              }                  if (o1 != null) {                    return (o2 != null) ? o1[0].compareTo(o2[0]) : 1;              }              return -1;          }      });  

Then it won't sort like integer but like String. Ex: it will sort like this:

No  1  10  2  20  5  

Then it is not correct.

So tried:

 columnSortHandler.setComparator(noColumn, new Comparator<String[]>() {          @Override          public int compare(String[] o1, String[] o2) {              if (o1==o2) {                    return 0;              }                  if (o1 != null) {                    return (o2 != null) ? Integer.parseInt(o1[0]).compareTo(Integer.parseInt(o2[0]) : 1;              }              return -1;          }      });  

But compareTo does not apply for Integer.

So my question is

How to @Override Comparator to make the Column in CellTable sort based on Integer not based on String (GWT)?

(also http://stackoverflow.com/questions/22743000/how-to-override-comparator-to-make-the-column-in-celltable-sort-based-on-intege)

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