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

24 votes119 views6 answers
Arrays in java
Java
0 vote147 views1 answer
@parameters on test use jupyter junit api
Java
0 vote106 views1 answer
Loop will array length java example
Java
0 vote125 views1 answer
Read file java line
Java
0 vote122 views1 answer
Java stringbuilder setcharat
Java
8 votes129 views1 answer
Import math java
Java
4 votes118 views2 answers
Java run cmd
Java
0 vote206 views1 answer
Java list of a class has a string that is equal to
Java
0 vote125 views1 answer
Difference between compile and execute in java
Java
0 vote130 views1 answer
At com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:251)
Java