The Java.util.EnumMap.size() method in java is used to know the size of the map or the number of elements present in the map.
Syntax:
Enum_Map.size()
Parameters: The method does not take any parameters.
Return Value: The method returns the size of the map.
Below programs illustrate the working of size() function:
Program 1:
// Java program to demonstrate size()import java.util.*; // An enum of neveropenpublic enum gfg { India_today, United_States_today}; class Enum_demo { public static void main(String[] args) { EnumMap<gfg, Integer> mp = new EnumMap<gfg, Integer>(gfg.class); // Values are associated mp.put(gfg.India_today, 69); mp.put(gfg.United_States_today, 1073); // Prints the map System.out.println("The EnumMap: " + mp); // Store the size of the map int numberOf_kv = mp.size(); // Prints the map_size System.out.println("Size of map: " + numberOf_kv); }} |
Output:
The EnumMap: {India_today=69, United_States_today=1073}
Size of map: 2
Program 2:
// Java program to demonstrate size()import java.util.*; // An enum of neveropenpublic enum gfg { India_today, United_States_today}; class Enum_demo { public static void main(String[] args) { EnumMap<gfg, Integer> mp = new EnumMap<gfg, Integer>(gfg.class); // Values are associated mp.put(gfg.India_today, 69); mp.put(gfg.United_States_today, 1073); // Prints the map System.out.println("The EnumMap: " + mp); // Remove mapping of this key mp.remove(gfg.United_States_today); // Prints the final map System.out.println("The EnumMap: " + mp); // Store the size pf map after removal of // The key int numberOf_kv = mp.size(); // Prints the map_size System.out.println("Size of map: " + numberOf_kv); }} |
Output:
The EnumMap: {India_today=69, United_States_today=1073}
The EnumMap: {India_today=69}
Size of map: 1
