Copy contents of an int array to a double array in Java?

Question

I'm trying to copy the contents of my int array into an array of type double. Do I have to cast them first?

I successfully copied an array of type int to another array of type int. However now I want to write code that would copy contents from Array A to Array Y (int to double).

Here is my code:

public class CopyingArraysEtc {

    public void copyArrayAtoB() {
        double[] x = {10.1,33,21,9},y = null;
        int[] a = {23,31,11,9}, b = new int[4], c;

        System.arraycopy(a, 0, b, 0, a.length);

        for (int i = 0; i < b.length; i++)
        {
            System.out.println(b[i]);
        }

    }          

    public static void main(String[] args) {
        //copy contents of Array A to array B
        new CopyingArraysEtc().copyArrayAtoB();
    }
}

Have you tried running it? does it work? do you get any errors? Not entirely sure what the question is. — Colin D
– Colin D, Commented Oct 4, 2012 at 14:18

Mureinik · Accepted Answer · 2016-03-06 22:15:39Z

28

Worth mentioning that in this day and age, Java 8 offers an elegant one-liner to do this without the need to use third-party libraries:

int[] ints = {23, 31, 11, 9};
double[] doubles = Arrays.stream(ints).asDoubleStream().toArray();

answered Mar 6, 2016 at 22:15

Mureinik

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1 Comment

Kango_V Over a year ago

This could be a performance hog if you do that thousands/millions of times. Creating many streams of only a few items can degrade performance.

Koerr · Accepted Answer · 2012-10-04 14:31:49Z

13

System.arraycopy() can't copy int[] to double[]

How about using google guava:

int[] a = {23,31,11,9};

//copy int[] to double[]
double[] y=Doubles.toArray(Ints.asList(a));

answered Oct 4, 2012 at 14:31

Koerr

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Comments

Bhesh Gurung · Accepted Answer · 2012-10-04 14:38:46Z

11

You can iterate through each element of the source and add them to the destination array. You don't need an explicit cast going from int to double because double is wider.

int[] ints = {1, 2, 3, 4};
double[] doubles = new double[ints.length];
for(int i=0; i<ints.length; i++) {
    doubles[i] = ints[i];
}

You can make a utility method like this -

public static double[] copyFromIntArray(int[] source) {
    double[] dest = new double[source.length];
    for(int i=0; i<source.length; i++) {
        dest[i] = source[i];
    }
    return dest;
}

edited Oct 4, 2012 at 14:38

answered Oct 4, 2012 at 14:18

Bhesh Gurung

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1 Comment

binary101 Over a year ago

Brilliant, thanks for taking the time to explain that :) Its exactly what i was after.

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

From System.arraycopy JavaDoc

[...] Otherwise, if any of the following is true, an ArrayStoreException is thrown and the destination is not modified:

*...

*...

*The src argument and dest argument refer to arrays whose component types are different primitive types. [...]

Since int and double are different primitive types you will have to manually iterate through one array and copy its content to another one.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Oct 4, 2012 at 14:27

Pshemo

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