EnumMap size() Method in Java
Last Updated :
13 Jul, 2018
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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:
Java
Java
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:
Program 2:
The EnumMap: {India_today=69, United_States_today=1073}
Size of map: 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
