Get weekday from int
I have this listing
public enum Weekday {
Sunday(0), Monday(1), Tuesday(2), Wednesday(3), Thursday(4), Friday(5), Saturday(6);
private int value;
private Weekday(int value) {
this.value = value;
}
}
And I can get value from the day if I know what day I want and now my brain is frozen and I am trying to make an oppostie. And I can't figure it out
So I know I have number 2 and then want to return a variable of type Weekday type Tuesday?
How can i do this?
Thanks for the help:)
source to share
You can use a map and then create a type method getByCode
where you pass the day number as an argument and it will return you an enum. For example.
import java.util.HashMap;
import java.util.Map;
enum Weekday {
Sunday(0), Monday(1), Tuesday(2), Wednesday(3), Thursday(4), Friday(5), Saturday(6);
private int value;
Weekday(int c){
this.value =c;
}
static Map<Integer, Weekday> map = new HashMap<>();
static {
for (Weekday catalog : Weekday.values()) {
map.put(catalog.value, catalog);
}
}
public static Weekday getByCode(int code) {
return map.get(code);
}
}
You can call the above method for example Weekday.getByCode(2)
and it will return youTuesday
source to share
Weekday.values()
returns an array with all the enumeration values. Each enumeration value has a method ordinal()
that returns it in the enumeration declaration.
In this case, when the value is equal to the index , you can simplify your code:
public enum Weekday {
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday;
}
Get value:
Weekday.Sunday.ordinal()
Get enum value:
Weekday.values()[value]
source to share