Syntax error Get the count of elements in HashMap in Java

Get the count of elements in HashMap in Java

Use the size() method to get the count of elements.

Let us first create a HashMap and add elements −

HashMap hm = new HashMap();
// Put elements to the map
hm.put("Maths", new Integer(98));
hm.put("Science", new Integer(90));
hm.put("English", new Integer(97));

Now, get the size −

hm.size()

The following is an example to get the count of HashMap elements −

Example

 Live Demo

import java.util.*;
public class Demo {
   public static void main(String args[]) {
      // Create a hash map
      HashMap hm = new HashMap();
      // Put elements to the map
      hm.put("Maths", new Integer(98));
      hm.put("Science", new Integer(90));
      hm.put("English", new Integer(97));
      hm.put("Physics", new Integer(91));
      hm.put("Chemistry", new Integer(93));
      // Get a set of the entries
      Set set = hm.entrySet();
      // Get an iterator
      Iterator i = set.iterator();
      // Display elements
      while(i.hasNext()) {
         Map.Entry me = (Map.Entry)i.next();
         System.out.print(me.getKey() + ": ");
         System.out.println(me.getValue());
      }
      System.out.println();
      System.out.println("Count of elements = "+hm.size());
   }
}

Output

Maths: 98
English: 97
Chemistry: 93
Science: 90
Physics: 91
Size: 5
Updated on: 2019-07-30T22:30:24+05:30

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