Java EnumMap size() method

The size() method of Java EnumMap class is used to get the size of the EnumMap. This method returns an integer whose value is the number of key-value mappings in this EnumMap.

Syntax

Parameters

Returns

This method returns the size of this EnumMap.

Exception

Example 1

import java.util.*;
public class EnumMapSizeExample1 {
  // create an enum
  public enum Tutorial {
  Java, CSS, Python, Android, Javascript
  };
  public static void main(String[] args) {
  EnumMap<Tutorial, String>  map =
	              new EnumMap<Tutorial, String> (Tutorial.class);

  map.put(Tutorial.Java, "1");
  map.put(Tutorial.CSS, "2");
  map.put(Tutorial.Python, "3");
  map.put(Tutorial.Android, "4");	   
  //print the map
  System.out.println("Map: "+map);
  //print the number of mapping of this map
  System.out.println("Number of mappings: "+map.size());
  //put one Key-value in this map
  map.put(Tutorial.Javascript, "5");
  //print the map
  System.out.println("Map: "+map);
  //print the new number of mappings of this map
  System.out.println("Number of mappings: "+map.size());
  }
}

Test it Now

Output:

Map: {Java=1, CSS=2, Python=3, Android=4}
Number of mappings: 4
Map: {Java=1, CSS=2, Python=3, Android=4, Javascript=5}
Number of mappings: 5

Example 2

import java.util.*;
public class EnumMapSizeExample2 {
   // create an enum
   public enum Days {
    Monday,Tuesday, Wednesday, Thursday
   };
   public static void main(String[] args) {
    EnumMap<Days, String>  map =
	              new EnumMap<Days, String> (Days.class);

    map.put(Days.Monday, "1");
    map.put(Days.Tuesday, "2");
    map.put(Days.Wednesday, "3");	      
    //print the map
    System.out.println("Map: "+map);
    //print the number of mapping of this map
    System.out.println("Number of mappings: "+map.size());
    //put one Key-value in this map
    map.put(Days.Thursday, "4");
    //print the map
    System.out.println("Map: "+map);
    //print the new number of mappings of this map
    System.out.println("Number of mappings: "+map.size());	
    }
}

Test it Now

Output:

Map: {Monday=1, Tuesday=2, Wednesday=3}
Number of mappings: 3
Map: {Monday=1, Tuesday=2, Wednesday=3, Thursday=4}
Number of mappings: 4

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Java EnumMap Class