Java HashMap - size() Method
The java.util.HashMap.size() method returns the total number of key-value mapping present in the map.
Syntax
public int size()
Parameters
No parameter is required.
Return Value
Returns the total number of key-value mapping in the map.
Exception
NA
Example:
In the example below, the java.util.HashMap.size() method is used to find out the total number of key-value mapping in the map.
import java.util.*;
public class MyClass {
public static void main(String[] args) {
//creating a hash map
HashMap<Integer, String> MyMap = new HashMap<Integer, String>();
//populating hash map
MyMap.put(101, "John");
MyMap.put(102, "Marry");
MyMap.put(103, "Kim");
MyMap.put(104, "Jo");
System.out.println("Size of MyMap: "+ MyMap.size());
//adding one more pair in the hash map
MyMap.put(105, "Ramesh");
System.out.println("Size of MyMap: "+ MyMap.size());
}
}
The output of the above code will be:
Size of MyMap: 4 Size of MyMap: 5
❮ Java.util - HashMap
