Java Cast from Object[] to double[] array and Double[] to double[] array

Question

Is there a way to cast an Object[] array into double[] array without using any loops. And cast Double[] array to double[] array

This answers the second part of your question: stackoverflow.com/questions/1109988/… — Barney
– Barney, Commented Feb 23, 2013 at 19:09
The above link says, I have to use loop, which I want to avoid. Java definitely failed here in comparison to .net (stackoverflow.com/questions/3741350/…) — Osman Khalid
– Osman Khalid, Commented Feb 26, 2013 at 5:55

tomrlh · Accepted Answer · 2019-03-02 14:56:00Z

1

In 2013 we haven't Java Stream API, just in march of 2014. With it you can get your answer:

From Object[] to double[]

Object[] objectArray = {1.0, 2.0, 3.0};

double[] convertedArray = Arrays.stream(objectArray) // converts to a stream
    .mapToDouble(num -> Double.parseDouble(num.toString())) // change each value to Double
    .toArray(); // converts back to array

From Double[] to double[]

Double[] doubleArray = {1.0, 2.0, 3.0};

double[] conv = Arrays.stream(doubArray)
    .mapToDouble(num -> Double.parseDouble(num.toString()))
    .toArray();

You notice that it's the same operation, since the resulting type for both conversions are double[]. What is changed is the source data.

PS: what a late answer :|

edited Mar 2, 2019 at 14:56

answered Mar 1, 2019 at 12:59

tomrlh

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1 Comment

Osman Khalid Over a year ago

Better late than never :)

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