容器打印

public class PrintContainers {

    static Collection fill(Collection<String> collection) {
        collection.add("rat");
        collection.add("cat");
        collection.add("dog");
        collection.add("dog");
        return collection;
    }

    static Map fill(Map<String, String> map) {
        map.put("rat", "米老鼠");
        map.put("cat", "喵瞄");
        map.put("dog", "拉拉");
        map.put("dog", "灰灰");
        return map;
    }


    public static void main(String[] args) {
        Print.print(fill(new ArrayList<String>()));
        Print.print(fill(new LinkedList<String>()));
        Print.print(fill(new HashSet<String>()));
        Print.print(fill(new TreeSet<String>()));
        Print.print(fill(new LinkedHashSet<String>()));
        Print.print(fill(new HashMap()));
        Print.print(fill(new TreeMap()));
        Print.print(fill(new LinkedHashMap()));
    }

}