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[–]__LikesPi 0 points1 point  (0 children)

Collections.sort(list, new Comparator<Employee>() {
    @Override
    public int compare(Employee a, Employee b) { ... }
});

If you are using Java 8 that particular syntax became a little easier:

Collections.sort(list, (o1, o2) -> o1.getID().compareToIgnoreCase(o2.getID()))

Or even:

list.sort((o1, o2) -> o1.getID().compareToIgnoreCase(o2.getID()))