如何在Java中迭代下面的Nestested HashMap

Question

我想遍歷以下HashMap。我想從中檢索關鍵字和值。

HashMap<String,List<HashMap<String, List<String >>>> maps = new HashMap<String, List<HashMap<String, List<String>>>>(); 

Answer 1

像這樣：

HashMap<String,List<HashMap<String, List<String >>>> maps = new HashMap<>(); 
for (Map.Entry<String, List<HashMap<String, List<String>>>> entry : maps.entrySet()) { 
    for (HashMap<String, List<String>> map : entry.getValue()) { 
     for (Map.Entry<String, List<String>> subEntry : map.entrySet()) { 
      for (String value : subEntry.getValue()) { 
       System.out.println(value); 
      } 
     } 
    } 
}