Conteúdo do arquivo

public class IntegerComparator implements Comparator
{
	public boolean isComparable(Object a)
	{
		if (a == null)
			return false;
		try
		{
			Integer i = (Integer) a;
		}
		catch (ClassCastException cce)
		{
			return false;
		}
		return true;
	}
	public int compare(Object a, Object b)
	{
		Integer x = (Integer) a;
		Integer y = (Integer) b;
		return x.intValue() - y.intValue();
	}
}