Best way to get Enum from its entire ID value in Java

Question

Best way to get Enum from its entire ID value in Java

Navigation

#1 by (1 votes)

0

A cordial greeting.

I have an ENUM in the following way

public enum EnumNumeros
{
    UNO(1),
    DOS(2),
    TRES(3);

    private int id;

    private EnumNumeros(int id)
    {
        this.id = id;
    }

    public int getId()
    {
        return id;
    }
}

In my application I want, from the whole value, for example 2, that the Enum object be returned to me: EnumNumeros.DOS

This I do it in the following way:

public static EnumNumeros getNumeroEnum(ObjetoJava objetoJava)
{
    EnumNumeros enumDevolver = null;


    int id = objetoJava.getObjetoNumero().getId();

    for(EnumNumero enumTemp: EnumNumero.values())
    {
        if(id == enumTemp.getId())
        {
            enumDevolver = enumTemp;
            break;
        }
    }

    return enumDevolver;
}

BUT

I wonder if there is a more direct way to achieve my goal, since the Enums have an elegant method to, from the description of the value Enum return to ENUM as such

EnumNumeros.valueOf( cadena_de_texto )

There should be some more elegant way of, from the ID value in my case, return the corresponding ENUM.

Thank you very much for your help.

java enum

asked by samz550a 26.01.2018 в 18:06

source

1 answer

ID Alfanumerico Django * ngFor nested does not show the results

score 1 · Accepted Answer

By default there is no direct way, but you can implement a static method in each enum in which you need a search for some attribute instead of its name.

In particular I got used to doing it with a map in the same enum. But you could do it with a for.

public enum EnumNumeros {
    UNO(1), DOS(2), TRES(3);
    private int id;
    private static final Map<Integer, EnumNumeros> MAP = new HashMap<>();
    private EnumNumeros(int id) { this.id = id; }
    public int getId() { return id; }
    public static EnumNumeros fromId(int id){
        return MAP.get(id);
    }
    static{
        for(EnumNumeros n : values()){
            MAP.put(n.getId(), n);
        }
    }
}