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Add elements to HashMap in Java
To add elements to HashMap, use the put() method.
First, create a HashMap −
HashMap hm = new HashMap();
Now, let us add some elements to the HashMap −
hm.put("Maths", new Integer(98)); hm.put("Science", new Integer(90)); hm.put("English", new Integer(97));
The following is an example to add elements to HashMap −
Example
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(); } }
Output
Maths: 98 English: 97 Chemistry: 93 Science: 90 Physics: 91
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