El método Java.util.EnumMap.entrySet() en Java se utiliza para crear un conjunto de elementos contenidos en EnumMap. Básicamente, devuelve una vista establecida del mapa de enumeración.
Sintaxis:
enum_map.entrySet()
Parámetro: El método no toma ningún parámetro.
Valor devuelto: el método devuelve la vista establecida de las asignaciones contenidas en este enum_map.
Los siguientes programas ilustran el método entrySet():
Programa 1:
// Java program to demonstrate entrySet() method import java.util.*; // An enum of gfg rank is created public enum rank_countries { India, United_States, China, Japan, Canada, Russia } ; class Enum_map { public static void main(String[] args) { EnumMap<rank_countries, Integer> mp = new EnumMap<rank_countries, Integer>(rank_countries.class); // Values are associated in mp mp.put(rank_countries.India, 72); mp.put(rank_countries.United_States, 1083); mp.put(rank_countries.China, 4632); mp.put(rank_countries.Japan, 6797); // Map view System.out.println("Map view: " + mp); // Creating a new set of the mappings // contained in map Set<Map.Entry<rank_countries, Integer> > set_view = mp.entrySet(); // Set view of the mappings System.out.println("Set view of the map: " + set_view); } }
Producción:
Map view: {India=72, United_States=1083, China=4632, Japan=6797} Set view of the map: [India=72, United_States=1083, China=4632, Japan=6797]
Programa 2:
// Java program to demonstrate entrySet() method import java.util.*; // An enum of gfg ranking worldwide and in india public enum gfg { Global_2018, India_2018 }; class Enum_map { public static void main(String[] args) { EnumMap<gfg, Integer> mp = new EnumMap<gfg, Integer>(gfg.class); // Values are associated in mp mp.put(gfg.Global_2018, 800); mp.put(gfg.India_2018, 72); // Mapping view System.out.println("Mapping view: " + mp); // Creating a new set of the mappings Set<Map.Entry<gfg, Integer> > set_view = mp.entrySet(); // Set view of the mappings System.out.println("Set view of the map: " + set_view); } }
Producción:
Mapping view: {Global_2018=800, India_2018=72} Set view of the map: [Global_2018=800, India_2018=72]