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About Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Get size of LinkedHashMap example

With this example we are going to demonstrate how to get the size of a LinkedHashMap, that is the number of key-value mappings in this LinkedHashMap. In short, to get the size of a LinkedHashMap you should:

  • Create a new LinkedHashMap.
  • Populate the linkedHashMap with elements, with put(K key, V value) API method of LinkedHashMap.
  • Invoke size() API method of LinkedHashMap. It returns the int number of key-value pairs that the linkedHashMap contains.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;
 
import java.util.LinkedHashMap;
 
public class SizeLinkedHashMap {
 
  public static void main(String[] args) {
 
    // Create a LinkedHashMap and populate it with elements
    LinkedHashMap linkedHashMap = new LinkedHashMap();
    linkedHashMap.put("key_1","value_1");
    linkedHashMap.put("key_2","value_2");
    linkedHashMap.put("key_3","value_3");

    // int size() operation returns the number of key value pairs stored in LinkedHashMap    
    System.out.println("Size of LinkedHashMap : " + linkedHashMap.size());
    
  }
}

Output:

Size of LinkedHashMap : 3

 
This was an example of how to get the size of a LinkedHashMap in Java.

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