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Question

How to construct an object with parameters from an array in Java? Or how to add a parameter to a array during construction

Answer 1

+3 A:

new Warenkorb("Dieter", new Artikel[] {new Artikel("Kartoffel", 0.25))};

Is this what you are trying to do?

willcodejavaforfood 2009-06-01 17:55:23

mmmm... Kartoffel... food is the only way I'm going to remember any of my Deutsch.

Jason S 2009-06-01 17:57:59

I hope I spelled that right :)

willcodejavaforfood 2009-06-01 18:02:30

Your spelling is great ;).I am dying of jealousy, i also want to be a java guru...

mrt181 2009-06-01 18:09:29

Answer 2

+2 A:

Is this what you want?

Artikel[] artikels = new Artikel[2];
artikels[0] = new Artikel("John Doe", 0);
artikels[1] = new Artikel("Jane Doe", 1);
Warenkorb w = new Warenkorb("something", artikels);

Your question isn't really clear on what you want to do...

matt b 2009-06-01 17:55:33

well we covered 2 possibilities :)

willcodejavaforfood 2009-06-01 17:56:33

+1. Exactly, you're like Tweedle-Dee and Tweedle-Dum. (and I meant that in the best possible way :)

Jason S 2009-06-01 17:57:19

at least his names were more locale-appropriate...

matt b 2009-06-01 17:58:05

yeah, what are the German equivalents for Jane Doe and John Doe?

Jason S 2009-06-01 18:47:56

They are Max Mustermann and Erika Mustermann

mrt181 2009-06-01 18:52:05

Answer 3

+1 A:

An alternative using an Iterable instead of an Array:

Warenkorb(String kunde, Iterable<? extends Artikel> artikel){
    this.kunde = kunde;
    artikelliste = artikel;
    sessionid = s.nextInt();
    summe = 0;
    for(Artikel preis : artikel){
            summe += preis.verkaufspreis;
    }
}

Can still be constructed using the other array based syntax but also:

new Warenkorb("Buffy", Arrays.asList(new Artikel("foo",0.0), new Artikel("bar",1.0));

works with any implementation of Iterable such as ArrayList or HashSet etc

Gareth Davis 2009-06-01 18:03:33

Answer 4

+2 A:

And, looks like you're using Java 1.5+ anyway, try this alternative for Warenkorb:

Warenkorb(String kunde, Artikel...artikel){
        this.kunde = kunde;
        artikelliste = artikel;
        sessionid = s.nextInt();
        summe = 0;
        for(Artikel preis : artikel){
                summe += preis.verkaufspreis;
        }
}

Written like this, you can get rid of the ugly Array notation and construct a Warenkorb like this:

new Warenkorb("Dieter", new Artikel("Kartoffel", 0.25)};
new Warenkorb("Günther", new Artikel("Kartoffel", 0.25), new Artikel("Tomate", 0.25)};

Andreas_D 2009-06-01 19:37:11

Yep, varargs are the way to go here. +1

Michael Myers 2009-06-01 19:58:24

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How to construct an object with parameters from an array in Java? Or how to add a parameter to a array during construction

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