Using unspecified number of arguments in another method

Question

Sorry but I'm not able to phrase this question properly without an example. Say oneMethod has such a signature:

void oneMethod(String... strings);

I call oneMethod by

void callOneMethod(int numStrings) {
    oneMethod("s" + 0, "s" + 1, ..., "s" + (numStrings - 1));
}

How should I write my callOneMethod?

Also, I very much appreciate it if anyone can help rephrase this question better :)

possible duplicate of How to create Java method that accepts variable number of arguments? — Dima
– Dima, Commented Jun 5, 2014 at 22:09
@Dima thanks for the reference. However my problem is more about how to pass unspecified arguments into a varargs-method at runtime. — goldfrapp04
– goldfrapp04, Commented Jun 5, 2014 at 22:20

fabian · Accepted Answer · 2014-06-05 22:34:27Z

2

The strings parameter is very similar to an array parameter. Therefore you can create an array to pass to oneMethod:

void callOneMethod(int numStrings) {
    String[] a = new String[numStrings];
    for (int i = 0; i < numStrings; i++) {
        a[i] = "s" + i;
    }
    oneMethod(a);
}

Clarification

Of course still your oneMethod(String... strings) method is used.

edited Jun 5, 2014 at 22:34

answered Jun 5, 2014 at 22:15

fabian

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4 Comments

goldfrapp04 Over a year ago

Thank you for the answer. However, I'm passing all numStrings number of strings into oneMethod at the same time. So what arguments oneMethod accepts is decided at runtime...

Dima Over a year ago

@goldfrapp04 this answer is the correct one. This allows you to pass whatever number of arguments you want. What is the issue?

goldfrapp04 Over a year ago

Oh! ok I guess I didn't understand varargs clearly. So essentially it sees the arguments as an array?

fabian Over a year ago

@goldfrapp04: Form inside a method with a vararg parameter you treat it as a array. When calling the method you can pass either an array (like in my code snipplet) or arbitrary number of arguments have the right type (e.g. oneMethod("a", "b", "c")).

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