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What is the scenario to use ConcurrentHashMap in Java?

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Pragya Keshap answered on February 4, 2023 Popularity 3/10 Helpfulness 1/10

answer What is the scenario to use ConcurrentHashMap in Java?

What is the scenario to use ConcurrentHashMap in Java?

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ConcurrentHashMap is more suited for scenarios where we have

multiple reader threads and one writer thread. In this case map is

locked only during the write operation.

If we have an equal number of reader and writer threads then

ConcurrentHashMap performance is similar to a Hashtable or a

synchronized HashMap

public class ConcurrentHashMapExample {

	public static void main(String[] args) {

		//ConcurrentHashMap
		Map<String,String> myMap = new ConcurrentHashMap<String,String>();
		myMap.put("1", "1");
		myMap.put("2", "1");
		myMap.put("3", "1");
		myMap.put("4", "1");
		myMap.put("5", "1");
		myMap.put("6", "1");
		System.out.println("ConcurrentHashMap before iterator: "+myMap);
		Iterator<String> it = myMap.keySet().iterator();

		while(it.hasNext()){
			String key = it.next();
			if(key.equals("3")) myMap.put(key+"new", "new3");
		}
		System.out.println("ConcurrentHashMap after iterator: "+myMap);

		//HashMap
		myMap = new HashMap<String,String>();
		myMap.put("1", "1");
		myMap.put("2", "1");
		myMap.put("3", "1");
		myMap.put("4", "1");
		myMap.put("5", "1");
		myMap.put("6", "1");
		System.out.println("HashMap before iterator: "+myMap);
		Iterator<String> it1 = myMap.keySet().iterator();

		while(it1.hasNext()){
			String key = it1.next();
			if(key.equals("3")) myMap.put(key+"new", "new3");
		}
		System.out.println("HashMap after iterator: "+myMap);
	}

}

https://www.digitalocean.com/community/tutorials/concurrenthashmap-in-java

Popularity 3/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: concurrenthashmap java

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

What is the scenario to use ConcurrentHashMap in Java?

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