Java 访问HashMap的ArrayList

我有以下数据结构：

dataModel.training = {ArrayList@4748}  size = 4
    0 = {HashMap@4784}  size = 6
      0 = {HashMap$HashMapEntry@4790} "controller" -> "Training01"
            key = {String@4796} "controller"
            value = {String@4797} "Training01"
      1 = {HashMap$HashMapEntry@4791} "description" -> "0101_0"
      2 = {HashMap$HashMapEntry@4792} "subset" -> "0,62"
      3 = {HashMap$HashMapEntry@4793} "table" -> "voctrain"
      4 = {HashMap$HashMapEntry@4794} "template" -> "resthai"
      5 = {HashMap$HashMapEntry@4795} "form" -> "Training01"
   1 = {HashMap@4785}  size = 9
   2 = {HashMap@4786}  size = 9
   3 = {HashMap@4787}  size = 7

例如，如何获取ArrayList（dataModel.training[0]）第一个条目中的键“controller”的值

如果你想用一句话来表达

dataModel.training.get(0).get("controller");

同样，您可以对所有其他键和值进行泛化

希望这有帮助

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祝你好运

你把我带到了正确的道路上！但是我必须强制转换，因为返回类型是对象：Map=（Map）dataModel.training.get（0）；和String controller=（String）map.get（“controller”）；谢谢您！

dataModel.training.get(0).get("controller");