Combined usage of String and Varargs in String.format()

Question

Wondering if it is possible to combine both a single string and varargs string in a String.format(), like this:

String strFormat(String template, String str, String... moreStrs) {    
    return String.format(template, str, moreStrs);
}

If I call the above like this:

strFormat("%s/%s/%s", "hello", "world", "goodbye");

I get java.util.MissingFormatArgumentException: Format specifier 's'

This works:

String strFormat(String template, String... moreStrs) {    
    return String.format(template, moreStrs);
}

As well as this works:

String strFormat(String template, String str1, String str2) {    
    return String.format(template, str1, str2);
}

Is it possible to get this to work?

String strFormat(String template, String str, String... moreStrs) {    
    return String.format(template, str, moreStrs);
}

Thanks!

Udell

Why do you want to break out one str from the rest of the strings? Are you attempting to require at least one str to be passed? – Child

No, that's not how the API is defined. Why do you want to do that? – Apologete

@Child and to Jim Garrison: Was just curious to see if it would work and wanted to know the work-around if it did not. – Udell

Answer 1

You can do it like this:

String strFormat(String template, String str, String... moreStrs)
{
    String[] args = new String[moreStrs.length + 1];

    // fill the array 'args'
    System.arraycopy(moreStrs, 0, args, 0, moreStrs.length);
    args[moreStrs.length] = str;

    return String.format(template, args);
}

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