// Create a list
    String[] strArray = new String[] {"z", "a", "C"};
    List list = Arrays.asList(strArray);

   // Sort
    Collections.sort(list);
   // C, a, z

   // Case-insensitive sort
   Collections.sort(list, String.CASE_INSENSITIVE_ORDER);
   // a, C, z

   // Reverse-order sort
   Collections.sort(list, Collections.reverseOrder());
   // z, a, C

   // Case-insensitive reverse-order sort
   Collections.sort(list, String.CASE_INSENSITIVE_ORDER);
   Collections.reverse(list);
   // z, C, a

Collection.sort(myList,new MyComparatorClass());

public class MyComparator  implements Comparator {

public int compare(Object o1, Object o2) {

    return o1.getName().compareTo(o2.getName());
    }
}

public interface Comparator<T> {
int compare(T o1, T o2);
 boolean equals(Object obj);
}

public class DateOrderComparator implements Comparator

public class RankCodeComparator implements Comparator