Is there an elegant, clean way for converting primitive data type double
array to OO Double
array (eg double[]
into Double[]
)?
There are some nice solutions out there, eg
int[] intArray = { ... };
Integer[] what = Arrays.stream( intArray ).boxed().toArray( Integer[]::new );
Integer[] ever = IntStream.of( intArray ).boxed().toArray( Integer[]::new );
(taken from here ), but this requires Java 8 . Is there a similar elegant, performant way for Java 7 and below?
If you want a one liner that compiles with Java 7, you can use ArrayUtils from Apache Commons. Eg
Integer[] what = ArrayUtils.toObject(intArray);
Works for any primitive type. That's probably more "elegant" and "clean" than the Java 8 code you posted. If you want to avoid libraries like Apache Commons, I am afraid you have to use a for loop.
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