CODEWITHSUNDEEP
javaarraysstringinteger
Adam Matan
Adam Matan

Reputation: 136509

Java: Copy array of Integers into Array of Strings

Consider a method whose signature contains an Integer Array:

public static void parse(Integer[] categories)

parse needs to call a different method, which expects an Array of Strings. So I need to convert Integer[] to String[].

For example, [31, 244] ⇒ ["31", "244"].

I've tried Arrays.copyOf described here:

String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);

But got an ArrayStoreException.

I can iterate and convert each element, but is there a more elegant way?

Upvotes: 1

Views: 6295

Answers (3)

anubhava
anubhava

Reputation: 786329

If you're not trying to avoid a loop then you can simply do:

String[] strarr = new String[categories.length];
for (int i=0; i<categories.length; i++)
     strarr[i] = categories[i] != null ? categories[i].toString() : null;

EDIT: I admit this is a hack but it works without iterating the original Integer array:

String[] strarr = Arrays.toString(categories).replaceAll("[\\[\\]]", "").split("\\s*,\\s*");

Upvotes: 3

fnobbi
fnobbi

Reputation: 90

i don't think that theres a method for it:

use a loop for it like:

String strings[] = new String[integerarray.length];

for(int i = 0; i<integerarray.length;++i)
{
     strings[i] = Integer.toString(integerarray[i]);
}

Upvotes: 1

malexmave
malexmave

Reputation: 1300

You could do it manually by iterating over the Int-Array and saving each element into the String-Array with a .toString() attached:

for(i = 0; i < intArray.length(); i++) {
    stringArray[i] = intArray[i].toString()
}

(Untested, but something like this should be the thing you are looking for)

Hmmm, just read your comment. I don't know any easier or more elegant way to do this, sorry.

Upvotes: 1

Related Questions