null in variable arguments (dot notation) [duplicate]

Question

Is there an idiomatic way to handle null arguments in variable arguments lists (with the dot notation)?I've found it's a bit clunky when there is only one null, argument. Below code throws NPE on marked line.

public class FooMain {

    public static boolean checkIsOneOf(String value, String ... acceptedValues) {
        for (String acceptedValue : acceptedValues) {
            // do stuff
        }
       return false;
   }

    public static void main(String args[]) throws Exception {
        System.out.println(checkIsOneOf("foo", "a", null));
        System.out.println(checkIsOneOf("foo", "a"));
        System.out.println(checkIsOneOf("foo", null)); // NPE
    }
}

Check if acceptedValues is null before you iterate through the items. — mdl
– mdl, Commented Jan 9, 2014 at 19:52

Marcus Junius Brutus · Accepted Answer · 2014-01-09 19:22:47Z

2

A simple cast on the line marked 'NPE' solves the issue:

System.out.println(checkIsOneOf("foo", (String) null)); // no longer NPE

answered Jan 9, 2014 at 19:22

Marcus Junius Brutus

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