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Java Hashmap size() Method
What is a Hashmap?
Hashmap was first introduced in Java 1.2.The Hashmap class is included in the java.util package.The data in a hashmap is stored in two parts: the key and the value, which can be accessed using an index of another type.A hashmap have unique keys , inserting a duplicate key will replace the data of the key. Hashmap class have many inbuilt method, one of those method is Java Hashmap size() Method.
To know more about Hashmap size() Method read the complete article
Java Hashmap size() Method
The hashmap size() method checks the size of the hashmap . In other words it checks how many key/ value pairs are present in the hashmap. Below in this page you can find it’s syntax, return values, parameters with detailed examples.
Syntax :
hashmap.size();
Parameters :
This method does not take any parameters.
Return values :
It returns the size of the hashmap.
Hashmap size() Method Examples
Example :
import java.util.*;
public class Main
{
public static void main (String[]args)
{
// Creating an empty HashMap
HashMap < Integer, String > hash_map_1 =
new HashMap < Integer, String > ();
// Mapping string values to int keys in a empty hashmap
hash_map_1.put (10, "Java");
hash_map_1.put (20, "Hashmap");
hash_map_1.put (25, "size");
hash_map_1.put (30, "method");
//checking the size of the hashmap
System.out.println (hash_map_1.size ());
}
}
Output :
Size of hashmap is : 4
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