How to pass all the values from ArrayList[] to int[] intArray

Question

I am working on part of a quiz(homework) and one part of my code I need to pass values FROM ArrayList[] locations TO int[] intArray. How is this done?? Thank you.

1. ArrayList locations = new ArrayList();
2. int anArray = locations.size();
3. int[] intArray = new int[anArray];

Thank you

Duplicated: http://stackoverflow.com/questions/2745338/convert-an-arraylist-to-an-object-array — Juan Mellado, Feb 22 '12 at 00:43

score 0 · Answer 1 · answered Feb 22 '12 at 00:33

0

Does he mean this?

ArrayList<Integer> locations = new ArrayList<Integer>();
int anArray = locations.size();
int[] intArray = new int[anArray];
int i = 0;
for(int location : locations){
   intArray[i++] = location;
}

answered Feb 22 '12 at 00:33

AlanFoster

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@yegor256 Oops. I'll pretend that was his part of the homework.. *whistles* – AlanFoster Feb 22 '12 at 00:36

score 0 · Answer 2 · answered Feb 22 '12 at 00:35

Assuming you have an ArrayList of Integer objects, you can simply loop through the ArrayList and put the elements in intArray like so:

for (int index = 0; index < locations.size(); index++) {
    intArray[index] = (Integer) locations.get(index);
}

Hope that helps.

score 0 · Answer 3 · answered Feb 22 '12 at 04:31

0

How about using toArray():

ArrayList locations = new ArrayList();
int anArray = locations.size();
int[] intArray = new int[anArray];
intArray = locations.toArray();

answered Feb 22 '12 at 04:31

user1224917

1

How to pass all the values from ArrayList[] to int[] intArray

3 Answers3