ConcurrentMap

ConcurrentMap extends Map interface. ConcurrentMap offers better concurrency as compared to HashTable. ConcurrentHashMap doesn't lock entire map while you are trying to perform read and write operations.

import java.util.concurrent.*;

public class ConcurrentMapEx {
    public static void main(String args[]){
        ConcurrentMap<Integer, String> map;
        map = new ConcurrentHashMap<> ();
        
        map.put(1, "Arjun");
        map.put(2, "Krishna");
        map.put(3, "Anand");
        map.put(4, "Aswini");
        
        System.out.println(map);
    }
}

Output

{1=Arjun, 2=Krishna, 3=Anand, 4=Aswini}

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