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 vote145 views1 answer
Java get unique elements from array
Java
8 votes150 views3 answers
Java word count
Java
0 vote151 views1 answer
How to write a line in java
Java
0 vote122 views1 answer
Convert list of dto to map java
Java
2 votes119 views2 answers
Kotlin variable in string
Java
0 vote98 views0 answer
Java
0 vote160 views2 answers
Spring code in java
Java Spring
5 votes129 views1 answer
Android time
Java
0 vote130 views1 answer
Retrieving parent element from child aWebelement selenium java
Java
2 votes136 views1 answer
Java remove first element from array
Java