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Find the size of a HashMap in Java
Use the size() method to get the size of HashMap. Let us first create a HashMap
HashMap hm = new HashMap();
Now, add some elements −
hm.put("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Franes", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));Since, we added 5 elements above, therefore, the size() method will give 5 as the result −
set.size()
The following is an example to find the size of 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("Bag", new Integer(1100));
hm.put("Sunglasses", new Integer(2000));
hm.put("Franes", new Integer(800));
hm.put("Wallet", new Integer(700));
hm.put("Belt", new Integer(600));
Set set = hm.entrySet();
System.out.println("Elements in HashMap...");
// 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("Size of HashMap = "+set.size());
}
}Output
Elements in HashMap... Franes: 800 Belt: 600 Wallet: 700 Bag: 1100 Sunglasses: 2000 Size of HashMap = 5
Updated on: 30-Jul-2019
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