This post shows that the code below creates a List from an array.
double[] features = new double[19];
List<Double> list = new ArrayList(Arrays.asList(features));
I'm expecting list to contain 19 elements, each of which is 0.0. However, after running the code above, list only contains 1 element, which is [0.0, 0.0, ..., 0.0]. I'm running Java 6 and not sure if this is related.
Don't use Raw Types. Your features is empty. And you can't make a collection of a primitive type double, you need Double.
Double[] features = new Double[19]; // <-- an Object type
Arrays.fill(features, Double.valueOf(1)); // <-- fill the array
List<Double> list = new ArrayList<Double>(Arrays.asList(features));
System.out.println(list);
<> was introduced in Java 7 but OP states that he is using Java 6
Your features is empty. Not really and filling that array is not necessary for this example. (repost due to evil typo)
features isn't empty :P.Every array is also an object. You call to Arrays.asList creates a List with a single element, which is the entire array. So you are creating a List<double[]>, not a List<Double>. Since you were using a raw type, the compiler did not spot this error and compiled with only a warning message. If you would have typed new ArrayList<Double>(Arrays.asList(features)), your program would not have compiled.
new ArrayList<Double>(Arrays.asList(features)) but failed to understand what the problem was. Thanks for pointing it out.