Method compare

src/org/opensourcephysics/display/DataTable.java:2471–2476

(Object[] a, Object[] b)

	private static Comparator<Object[]> nCompare = new Comparator<Object[]>() {
		@Override
		public int compare(Object[] a, Object[] b) {
			return (a[0] != null && b[0] != null
					? Double.compare(((Number)a[0]).doubleValue(), ((Number)b[0]).doubleValue())
					: a[0] != null ? -1 : b[0] != null ? 1 : 0);
		}
	};
	private static Comparator<Object[]> sCompare = new Comparator<Object[]>() {
		@Override