Java HashMap size() Method
Java HashMapThe size() method is used to count the number of key/value pairs in the hashMap.
The syntax of the size() method is:
hashmap.size()
Note:hashmap is an object of the HashMap class.
Parameter Description:
- None
Return Value
Returns the number of key/value pairs in the hashMap.
Example
The following example demonstrates the use of the size() method:
Example
import java.util.HashMap;
class Main {
public static void main(String[] args) {
HashMap<Integer, String> sites = new HashMap<>();
// Add some elements to the HashMap
sites.put(1, "Google");
sites.put(2, "Example");
sites.put(3, "Taobao");
System.out.println("HashMap: " + sites);
// Get the number of key/value pair mappings in the HashMap
int size = sites.size();
System.out.println("Size of HashMap: " + size);
}
}
class Main {
public static void main(String[] args) {
HashMap<Integer, String> sites = new HashMap<>();
// Add some elements to the HashMap
sites.put(1, "Google");
sites.put(2, "Example");
sites.put(3, "Taobao");
System.out.println("HashMap: " + sites);
// Get the number of key/value pair mappings in the HashMap
int size = sites.size();
System.out.println("Size of HashMap: " + size);
}
}
Executing the above program outputs the result:
HashMap: {1=Google, 2=Example, 3=Taobao}
Size of HashMap: 3
In the above example, we created a HashMap named sites, and later in the code we used the size() method to count the number of key/value pairs in sites.
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