I’m trying to convert an ArrayList containing Integer objects to primitive int[] with the following piece of code, but it is throwing compile time error. Is it possible to convert in Java? List<Integer> x = new ArrayList<Integer>(); int[] n = (int[])x.toArray(int[x.size()]); 19 Answers 19
How can I convert a NSString containing a number of any primitive data type (e.g. int, float, char, unsigned int, etc.)? The problem is, I don’t know which number type the string will contain at runtime. I have an idea how to do it, but I’m not sure if this works with any type, also … Read more
You can convert, but I don’t think there’s anything built in to do it automatically: public static int[] convertIntegers(List<Integer> integers) { int[] ret = new int[integers.size()]; for (int i=0; i < ret.length; i++) { ret[i] = integers.get(i).intValue(); } return ret; } (Note that this will throw a NullPointerException if either integers or any element within it is null.) … Read more
