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javaparameters
Retsam
Retsam

Reputation: 33389

Passing several parameters as a single parameter in Java

I've seen an example of it before, but I've never really found any good reference material dealing with it. I know it's possible to pass in several parameters, ints for example, by defining the method as 

public void aMethod(int...a)

But I don't know any more about it than that. I've seen an example, and it returned the average of the ints passed.
Is this an out-dated way of passing parameters? Is it even acceptable to use this? What exactly is the syntax like when doing this? (Some reference material would be great)

Upvotes: 2

Views: 1317

Answers (2)

Andrew Hare
Andrew Hare

Reputation: 351466

You are going to have to pass a list of ints to the method to do this, something like this:

public void aMethod(int[] list)

or this:

public void aMethod(ArrayList<int> list)

It would be nice if Java had something like C#'s params keyword but it doesn't.

Upvotes: -1

Travis Jensen
Travis Jensen

Reputation: 5420

It's called varargs (from the C syntax). See Sun's varargs guide for an overview and this JDC Tech Tip for usage. It is not out-dated; it was put in as a feature request since previously you were forced to create an array or list, which was really ugly for supporting something like C's printf.

public void myMethod(String... args) {
    for (String aString:args) {
        System.out.println(aString);
    }
}

Upvotes: 12

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