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Java EnumMap size() Method with Example

EnumMap Class size() method: Here, we are going to learn about the size() method of EnumMap Class with its syntax and example.
Submitted by Preeti Jain, on February 10, 2020

EnumMap Class size() method

• size() method is available in java.util package.
• size() method is used to return the size of this enum map (i.e. it returns the number of key-value pairs exists in this enum map).
• size() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• size() method does not throw an exception at the time of returning the size of this map.

Syntax:

    public int size();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is int, it returns the number of key-value mappings exists in this enum map.

Example:

// Java program to demonstrate the example 
// of int size() method of EnumMap

import java.util.*;

public class SizeOfEnumMap {
    public enum Colors {
        RED,
        BLUE,
        PINK,
        YELLOW
    };
    public static void main(String[] args) {

        // We are creating EnumMap object
        EnumMap < Colors, String > em =
            new EnumMap < Colors, String > (Colors.class);

        // By using put() method is to
        // add the linked values in an
        // EnumMap (em)
        em.put(Colors.RED, "1");
        em.put(Colors.BLUE, "2");
        em.put(Colors.PINK, "3");
        em.put(Colors.YELLOW, "4");

        // Display EnumMap
        System.out.println("EnumMap (em) :" + em);

        // By using size() method isto
        // return the number of key-value
        // pairs exists in an EnumMap

        int size = em.size();

        // Display Size Of An EnumMap
        System.out.println("em.size(): " + size);
    }
}

Output

EnumMap (em) :{RED=1, BLUE=2, PINK=3, YELLOW=4}
em.size(): 4