How to get all items from the ArrayList when i looping the HashMap

Question

我没有从Hashmap获得第二个键值，它仅显示第一个键及其Arraylist值，我如何获得所有键和Arraylist值？

Answer 1

You can iterate the hash map and retrieve each key and value:

for (Map.Entry<String, ArrayList<fileModel>> entry : deviceBackUpFb.entrySet()) {

    String key = entry.getKey();
    ArrayList<fileModel> values = entry.getValue();

    for (fileModel value : values) {
        ...
    }
}

Answer 2

Hopefully I understand your question. Try this:

Iterator it = deviceBackUpFb.entrySet().iterator();
while (it.hasNext()) {
    Map.Entry pair = (Map.Entry)it.next();
    System.out.println(pair.getKey() + " = " + pair.getValue());
}

And then do whatever you want with the values.

pair.getKey(); // String
pair.getValue(); //ArrayList<model>

Answer 3

      for (Entry<String, ArrayList<fileModel>> entry : deviceBackUpFb.entrySet()){
             System.out.println(entry.getKey() + " " + entry.getValue());
         }