The Java.util.EnumMap.keySet() method in Java is used to return the set view of the keys contained in the map.
Syntax:
Enum_Map.keySet()
Parameters: The method does not accept any argument.
Return Value: The method returns the set view of the keys contained in the map.
Below programs illustrate the keySet() function:
Program 1:
// Java program to demonstrate keySet() import java.util.*;
// An enum of geeksforgeeks public enum gfg {
India,
United_States,
China
}; class Enum_demo {
public static void main(String[] args)
{
EnumMap<gfg, String> mp = new EnumMap<gfg, String>(gfg. class );
// Values are associated
mp.put(gfg.India, "61.7%" );
mp.put(gfg.United_States, "18.2%" );
mp.put(gfg.China, "2.5%" );
// Prints the map
System.out.println( "Mappings: " + mp);
// Store the set view of the key
Set<gfg> set_view = mp.keySet();
// Print the result
System.out.println( "Set view of the key: " +
set_view);
}
} |
Output:
Mappings: {India=61.7%, United_States=18.2%, China=2.5%} Set view of the key: [India, United_States, China]
Program 2:
// Java program to demonstrate keySet() import java.util.*;
// An enum of geeksforgeeks public enum gfg {
Global_today,
India_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.Global_today, 799 );
mp.put(gfg.India_today, 69 );
// Prints the map
System.out.println( "Mappings: " + mp);
// Store the set view of the key
Set<gfg> set_view = mp.keySet();
// Print the result
System.out.println( "Set view of the key: " +
set_view);
}
} |
Output:
Mappings: {Global_today=799, India_today=69} Set view of the key: [Global_today, India_today]