/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 vote142 views1 answer
Creategoogle maps marker with custom image/bitmap
Java
13 votes143 views6 answers
Method in java
Java
0 vote138 views1 answer
Instance block
Java
1 vote149 views1 answer
While looping in java
Java
2 votes142 views1 answer
Zufallszahlen in java
Java
0 vote144 views2 answers
Hide icon android studio
Java
0 vote128 views1 answer
Change color in recyclerview
Java
-3 votes129 views3 answers
Toast android
Java
0 vote134 views1 answer
Add checkbox box rows in tabulator
Java
0 vote154 views1 answer
Jax-RS POST annotation
Java