/Java/Group all keys with same values in a hashmap java

Group all keys with same values in a hashmap java

Map<String, ArrayList<Integer>> reverseMap = new HashMap<>();

for (Map.Entry<Integer,String> entry : map.entrySet()) {
    if (!reverseMap.containsKey(entry.getValue())) {
        reverseMap.put(entry.getValue(), new ArrayList<>());
    }
    ArrayList<Integer> keys = reverseMap.get(entry.getValue());
    keys.add(entry.getKey());
    reverseMap.put(entry.getValue(), keys);
}

Source: stackoverflow.com

Similar codes

0 vote198 views1 answer
BottomNavigationView only icon
Java
0 vote189 views1 answer
RNGestureHandlerButtonViewManager.java uses or overrides a deprecated API
Java
0 vote241 views1 answer
Copy one string to another without using any loops or assignment operator
Java
2 votes186 views1 answer
Jagx stock
Java
0 vote210 views1 answer
Pioneer meaning
Java
0 vote270 views1 answer
Java.sql.sqlsyntaxerrorexception: unknown column
Java
0 vote234 views4 answers
"%(class)s" in django
Java
0 vote206 views1 answer
Java abstract modifier
Java
0 vote191 views1 answer
Java instant from timestamp string
Java
0 vote243 views1 answer
Fhow to find location of java jdk
Java