Retriving data from Nested HashMap

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0

This is my HashMap declaration:

HashMap<String, HashMap<ArrayList<String>, ArrayList<String>>> myMap;

Now I have created 2 arraylist

ArrayList<String> FirstAL = new ArrayList<String>();
ArrayList<String> SecondAL = new ArrayList<String>();

In onCreate() I have added items to arraylist and to HashMap

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    FirstAL.add("a");
    FirstAL.add("b");
    FirstAL.add("c");

    SecondAL.add("1");
    SecondAL.add("2");
    SecondAL.add("3");

    myMap.put("myKey", new HashMap<ArrayList<String>, ArrayList<ArrayList<String>>>());
    myMap.get("myKey").put(FirstAL, SecondAL);

    // now while retriving I'm getting null instead of Arraylist
    ArrayList<String> resultAL = myMap.get("myKey").get("a");

}

Thnx in Advance. Please help me to figure where did I went wrong?

asked 1 min ago

kevz

220