CODEWITHSUNDEEP
java
rickygrimes
rickygrimes

Reputation: 2716

Iterate through nested map

I have a nested hashmap (Hashmap inside a hashmap). 

Map<String,Map<String,String>> test = new HashMap<String,Map<String,String>>();
    Map<String,String> testMp = new HashMap<String,String>();
    testMp.put("1", "Key1");
    testMp.put("2", "Key2");
    testMp.put("3", "Key3");
    testMp.put("4", "Key4");
    testMp.put("5", "Key4");
    test.put("One", testMp);

Ideally if I need to print the key and the values in the test map, I'd do this -

for(Map.Entry<String, Map<String,String>> t:test.entrySet()) {
            System.out.println("KEY: " +t.getKey()+ " VALUE:" +t.getValue());
}

But I want the key and the value of the inner map as well. I want something like this -

Key of outermap
    Key of innermap, and its value.

Upvotes: 1

Views: 3931

Answers (2)

Eran
Eran

Reputation: 394136

Then do a nested loop :

for(Map.Entry<String, Map<String,String>> t:test.entrySet()) {
   String key = t.getKey();
   for (Map.Entry<String,String> e : t.getValue().entrySet())
     System.out.println("OuterKey: " + key + " InnerKey: " + e.getKey()+ " VALUE:" +e.getValue());
}

or 

for(Map.Entry<String, Map<String,String>> t:test.entrySet()) {
   System.out.println(t.getKey());
   for (Map.Entry<String,String> e : t.getValue().entrySet())
     System.out.println("KEY: " + e.getKey()+ " VALUE:" +e.getValue());
}

Upvotes: 3

Darshan Mehta
Darshan Mehta

Reputation: 30849

Write a recursive method which will call itself when it encounters that the entry to corresponding key is a map.

Upvotes: 1

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