我有以下map:Mapmap=newHashMap();键是整数，值是数组(也可以用列表代替)。现在，我想获得键值的所有可能组合。例如，假设map包含以下条目:key1:"test1","stackoverflow"key2:"test2","wow"key3:"new"组合包括("test1","test2","new")("test1","wow","new")("stackoverflow","test2","new")("stackoverflow","wow","new")为此我设想了一个方法booleanhasNext()如果存在下一对，则返回true，而第二个方法仅返回下