Java map get key by value

Java map get key from value

import java.util.HashMap;
import java.util.Map;
 
class Main
{
    public static <K, V> K getKey(Map<K, V> map, V value)
    {
        return map.entrySet().stream()
                .filter(entry -> value.equals(entry.getValue()))
                .findFirst().map(Map.Entry::getKey)
                .orElse(null);
    }
 
    public static void main(String[] args)
    {
        Map<String, Integer> hashMap = new HashMap();
        hashMap.put("A", 1);
        hashMap.put("B", 2);
        hashMap.put("C", 3);
 
        System.out.println(getKey(hashMap, 2));        // prints `B`
    }
}

Source: techiedelight.com

Similar codes

1 vote118 views1 answer
String to bigdecimal
Java
0 vote129 views2 answers
Balanced string in java
Java
4 votes134 views4 answers
Math class in java
Java
0 vote124 views1 answer
Java swing place objects vertically
Java
0 vote159 views1 answer
Android studio constraint layout proportional height
Java
1 vote139 views1 answer
Method reference in java
Java
0 vote128 views1 answer
Error inflating class android.support.design.widget.CoordinatorLayout
Java
0 vote131 views1 answer
Java difrence betwen x++ and ++x
Java
-1 vote153 views1 answer
React-cheat-sheet
Java
0 vote147 views1 answer
How to make plugin wait spigot
Java