Java Collection Tutorial - Java HashMap.size()

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Syntax

HashMap.size() has the following syntax.

public int size()

Example

In the following code shows how to use HashMap.size() method.

/*ww w  .j ava2 s  .  c  o  m*/

import java.util.HashMap;

public class Main {
   public static void main(String args[]) {
      HashMap<Integer, String> newmap = new HashMap<Integer, String>();      
      
      // populate hash map
      newmap.put(1, "tutorials");
      newmap.put(2, "from");
      newmap.put(3, "java2s.com");
      
      System.out.println("Size of the map: "+ newmap.size());
   }    
}

The code above generates the following result.

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