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+import java.util.Comparator;%0A%0Apublic class FieldDrillDownComparator implements Comparator%3CField%3E %7B%0A%0A%09public FieldDrillDownComparator() %7B%0A%09%7D%0A%0A%09@Override%0A%09public int compare(Field o1, Field o2) %7B%0A%09%09return Integer.valueOf(o1.getDrillDown()).compareTo(%0A%09%09%09%09Integer.valueOf(o2.getDrillDown()));%0A%09%7D%0A%0A%7D%0A

Create FieldDrillDownComparator.java