fooooobar

    package com.howardlewisship;
 
    import java.util.*;
 
    public class MapUtils {
        public static String sortedKeyList(Map<?, ?> map1, Map<?, ?> map2) {
            Set<Object> allKeys = new HashSet<Object>(map1.keySet());
            allKeys.addAll(map2.keySet());

            return allKeys.isEmpty() ? "<none>" : org.apache.commons.lang.StringUtils.join(new TreeSet<String>(allKeys), ",").toString();
        }
    }