按值数量对Guava Multimap排序

将条目提取到列表中，然后对列表进行排序：

List<Map.Entry<String, String>> entries = new ArrayList<Map.Entry<String, String>>(map.entries());Collections.sort(entries, new Comparator<Map.Entry<String, String>>() {    @Override    public int compare(Map.Entry<String, String> e1, Map.Entry<String, String> e2) {        return Ints.compare(map.get(e2.getKey()).size(), map.get(e1.getKey()).size());    }});

然后遍历条目。

编辑：

如果您实际上想要遍历内部映射（

Entry<String, Collection<String>>

List<Map.Entry<String, Collection<String>>> entries =     new ArrayList<Map.Entry<String, Collection<String>>>(map.asMap().entrySet());Collections.sort(entries, new Comparator<Map.Entry<String, Collection<String>>>() {    @Override    public int compare(Map.Entry<String, Collection<String>> e1,  Map.Entry<String, Collection<String>> e2) {        return Ints.compare(e2.getValue().size(), e1.getValue().size());    }});// and now iteratefor (Map.Entry<String, Collection<String>> entry : entries) {    System.out.println("Key = " + entry.getKey());    for (String value : entry.getValue()) {        System.out.println("    Value = " + value);    }}