I am trying to output information with System.out.format using a double[] array as the argument. This does not work:
out.format("New dimensions:\n" +
"Length: %f\n" +
"Width: %f\n\n",
doubleArray);
This, however, does:
out.format("New dimensions:\n" +
"Length: %f\n" +
"Width: %f\n\n",
doubleArray[0], doubleArray[1]);
Why doesn't the first format work? It supposedly works with strings just fine.
Java will autobox your double to a Double, but it won't autobox your double[] to a Double[], so it doesn't match Object[]. As a result, instead of being unpacked into the Object... varargs, your array is being treated as the array itself -- which, obviously, can't be formatted as a double.
If you declare your array as Double[] instead of double[], the call to format works.
Double[] and it seems to work now.It doesn't work because an array isn't a double(in Java an array is a class, so it's like a general pointer here). You need to specify exactly what will be outputted, and you did - it's the %f format specifier. ArraySomething[] doesn't match..
See here for more on Java's Formatting and here - How does array class work in Java? , for Java arrays.
