Here, Role is an enum which contains the following values [ADMIN, USER, OTHER].
List<Role> roleList = Arrays.asList(Role.values());
roleList.forEach(role -> {
System.out.println(role);
});
Enum
s are just like Class
es in that they are typed. Your current code just checks if it is an Enum without specifying what type of Enum it is a part of.
Because you haven't specified the type of the enum, you will have to use reflection to find out what the list of enum values is.
You can do it like so:
enumValue.getDeclaringClass().getEnumConstants()
This will return an array of Enum objects, with each being one of the available options.
One can also use the java.util.EnumSet like this
@Test
void test(){
Enum aEnum =DayOfWeek.MONDAY;
printAll(aEnum);
}
void printAll(Enum value){
Set allValues = EnumSet.allOf(value.getClass());
System.out.println(allValues);
}
YourEnumClass[] yourEnums = YourEnumClass.class.getEnumConstants();
Or
YourEnumClass[] yourEnums = YourEnumClass.values();
values method of enum
enum.values() method which returns all enum instances.
public class EnumTest {
private enum Currency {
PENNY("1 rs"), NICKLE("5 rs"), DIME("10 rs"), QUARTER("25 rs");
private String value;
private Currency(String brand) {
this.value = brand;
}
@Override
public String toString() {
return value;
}
}
public static void main(String args[]) {
Currency[] currencies = Currency.values();
// enum name using name method
// enum to String using toString() method
for (Currency currency : currencies) {
System.out.printf("[ Currency : %s,
Value : %s ]%n",currency.name(),currency);
}
}
}
http://javaexplorer03.blogspot.in/2015/10/name-and-values-method-of-enum.html
... or MyEnum.values() ? Or am I missing something?
Source: Stackoverflow.com