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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
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
Updated on: 30-Jul-2019
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