EnumMap size() Method in Java
Last Updated :
13 Jul, 2018
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:
import java.util.*;
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 );
mp.put(gfg.India_today, 69 );
mp.put(gfg.United_States_today, 1073 );
System.out.println( "The EnumMap: " + mp);
int numberOf_kv = mp.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:
import java.util.*;
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 );
mp.put(gfg.India_today, 69 );
mp.put(gfg.United_States_today, 1073 );
System.out.println( "The EnumMap: " + mp);
mp.remove(gfg.United_States_today);
System.out.println( "The EnumMap: " + mp);
int numberOf_kv = mp.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
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