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 geeksforgeeks public 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 geeksforgeeks public 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