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Asked: 2026-05-14T14:21:33+00:00

I have a function with a signature similar to String.format(String, Object…) . I want

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I have a function with a signature similar to String.format(String, Object...).

I want to call this function from JRuby without the last parameters (since it is optional), but my code throws an ArgumentError (wrong # of arguments(1 for 2))

Is there a way to call this function with only 1 argument just like I would do in Java?

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1 Answer

  1. Editorial Team

    Wrap the varargs into a Java array

      jruby-1.4.0 > java.lang.System.out.format('foo %d, %d, %d, %d, %d', [1, 2, 3, 4, 5].to_java)
  foo 1, 2, 3, 4, 5 => #<Java::JavaIo::PrintStream:0x79ef3ccd>

    If all you want is to skip the varargs, pass an empty Java array instead

      jruby-1.4.0 > java.lang.System.out.format('foo ', [].to_java)
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