构造函数未定义？ 枚举错误

Question

public Tipo getTipo() {
    return this.Importo < 0.0 ? Tipo.USCITA : Tipo.ENTRATA;
}

public int compareTo(Movimento m) {
    if (this.idConto != this.idConto) {
        return this.idConto - this.idConto;
    }
    return this.DataMov.compareTo(this.DataMov);
}

public static enum Tipo {
    ENTRATA,// here i have this error : The constructor Movimento.Tipo() is undefined
    USCITA;// here is the same : The constructor Movimento.Tipo() is undefined


    private Tipo(String string2, int n2) {
    }
}

I already have constructor that I need, what else I need to write?

Answer 1

You wrote a constructor that takes two arguments, but no default constructor. That means the compiler will not provide a no-arg constructor. You should provide one or remove the private constructor.

I see no reason for the private constructor with two arguments. You don't have any private data members in your enum.

Why is your enum static? Remove that.

public enum Tipo {
    ENTRATA, USCITA;

}

Answer 2

I am not sure how do you want to define enum. There are basically 2 solutions to this:

1. Define no parameter enum

public static enum Tipo {
    ENTRATA,
    USCITA;
}

2. Define enum with parameters

public static enum Tipo {
    ENTRATA("Entrata", 1),
    USCITA("Uscita", 2);

    private String string;
    private int integer;

    private Tipo(String string, int integer) {
        this.string = string;
        this.integer = integer;
    }
}

Answer 3

You are written wrong enum.

public enum abc {

    ENTRATA("abc", 1),// here i have this error : The constructor Movimento.Tipo() is undefined
    USCITA("xyz", 2);// here is the same : The constructor Movimento.Tipo() is undefined


    private abc(String string2, int n2) {
    }

}