Create a HashMap in Java

To create a HashMap, use the HashMap map and new −

HashMap hm = new HashMap();

Now, set elements −

hm.put("Finance", new Double(999.87));
hm.put("Operations", new Double(298.64));
hm.put("Marketing", new Double(39.56));

Display the elements now using the following code −

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("Finance", new Double(999.87));
      hm.put("Operations", new Double(298.64));
      hm.put("Marketing", new Double(39.56));
      // 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();
   }
}

Output

Finance: 999.87
Operations: 298.64
Marketing: 39.56