Can't convert double array to String using Apache Commons Lang

Question

I have been trying to convert a double array to a string where numbers are separated with a space.

public class StringTest {

    public static void main(String[] args) {

        double[] g =  {1.2,1.4,1.4} ;
        String d = StringUtils.join(g, " ");
        System.out.println(d);
    }
}

Commons Lang javadoc tells me that it is possible to do this, code runs as well but I get only [D@54a50a00 printed out. What is missing here?

My IDE says that it is calling the `join(T...)` method, where the inferred type of `T` is `Serializable`. That is because there is no method for `join(double[], String)`. You could replace `" "` with `' '`, to use the `join(double[], char)` method. — bcsb1001, Sep 09 '14 at 18:14

score 5 · Accepted Answer · answered Sep 09 '14 at 18:13

5

You are currently using StringUtils#join(T...). You seem to want to use StringUtils#join(double[], char). Simply change your " " to a ' '.

answered Sep 09 '14 at 18:13

Sotirios Delimanolis

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Marvelous! Thank you so much! – zamk Sep 09 '14 at 18:17
2

@zamk Note, if you don't know this already, that primitives don't work with generics. But `double[]` is not a primitive, it is a reference type. – Sotirios Delimanolis Sep 09 '14 at 18:18

Can't convert double array to String using Apache Commons Lang

1 Answers1