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Is it possible to replace Hashtable with ConcurrentHashMap in Java?

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Pragya Keshap answered on February 4, 2023 Popularity 1/10 Helpfulness 1/10

answer Is it possible to replace Hashtable with ConcurrentHashMap in Java?

Is it possible to replace Hashtable with ConcurrentHashMap in Java?

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Yes, a ConcurrentHashMap can be replaced with Hashtable in Java.

But it requires careful observation, since locking behavior of

Hashtable is different than that of ConcurrentHashmap.

A Hashtable locks whole Map instead of a portion of Map.

Compound operations like if(Hashtable.get(key) == null) put(key,

value) work in Hashtable but not in ConcurrentHashMap.

In a ConcurrentHashMap we use putIfAbsent() method for such a

scenario.

public class GFG {
 
    // Main driver method
    public static void main(String[] args)
    {
 
        // Try block to check for exceptions
        try {
 
            // Creating object of HashMap
            // Declaring object of integer and string type
            HashMap<Integer, String> map = new HashMap<>();
 
            // Adding entry to map object created above
            // Custom input entries
            map.put(65, "A");
            map.put(66, "B");
            map.put(67, "C");
            map.put(68, "D");
 
            // Print and display the map object
            System.out.println("Map is " + map);
 
            // Creating a synchronized map object
            // Declaring object of type integer and string
            Map<Integer, String> synmap
                = Collections.synchronizedMap(map);
 
            // Print and display the synchronized map
            // elements
            System.out.println("Synchronized map is : "
                               + synmap);
        }
 
        // Catch block to handle the exceptions
        catch (IllegalArgumentException e) {
 
            // Display the exception on the console
            System.out.println(e);
        }
    }
}

https://www.geeksforgeeks.org/difference-between-concurrenthashmap-hashtable-and-synchronized-map-in-java/

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: concurrenthashmap hashtable java replace

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Is it possible to replace Hashtable with ConcurrentHashMap in Java?

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