java - What's the best way to sum two Map<String,String>? -

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i have following maps.

map<string,string> map1= new hashmap<string, string>(){{        put("no1","123"); put("no2","5434"); put("no5","234");}};  map<string,string> map1 = new hashmap<string, string>(){{        put("no1","523"); put("no2","234"); put("no3","234");}};  sum(map1, map2);

i want join them one, summing similar keyed values together. what;s best way using java 7 or guava libraries ?

expected output 

map<string, string> output = { { "no1" ,"646"}, { "no2", "5668"}, {"no5","234"}, {"no3","234" }  } 

private static map<string, string> sum(map<string, string> map1, map<string, string> map2) {         map<string, string> result = new hashmap<string, string>();         result.putall(map1);         (string key : map2.keyset()) {             string value = result.get(key);             if (value != null) {                 integer newvalue = integer.valueof(value) + integer.valueof(map2.get(key));                 result.put(key, newvalue.tostring());             } else {                 result.put(key, map2.get(key));             }         }         return result;     }

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