Welcome to the Java Programming Forums
The professional, friendly Java community. 21,500 members and growing!
The Java Programming Forums are a community of Java programmers from all around the World. Our members have a wide range of skills and they all have one thing in common: A passion to learn and code Java. We invite beginner Java programmers right through to Java professionals to post here and share your knowledge. Become a part of the community, help others, expand your knowledge of Java and enjoy talking with like minded people. Registration is quick and best of all free. We look forward to meeting you.
>> REGISTER NOW TO START POSTING
Members have full access to the forums. Advertisements are removed for registered users.
LinkBack URL
About LinkBacks
Object array to int array?
ArrayList<Integer> in = new ArrayList<Integer>(); //fill arraylist...... int[] out;
When using the ArrayList method toArray() it returns Object[], how would I go about converting this to int[]?
out = in.toArray();
Found java.lang.Object[] but expected int[]
The most "obvious" solution i tried was a cast..but of course to no surprise i cant do that with an array.
am i forced to pull each entry from the List using a loop?
Last edited by rsala004; October 30th, 2009 at 12:59 AM.
Related threads:
Re: Object array to int array?
Yes thats correct, you will come across some issues doing this, however you can convert your list of Integer into an array of Integer with no big problems, its just the matter of converting it to an array of primitives you will need to loop through the indexes I believe.
Auto (un)boxing is only so good I'm afraid
final List<Integer> intList = new ArrayList<Integer>(); intList.add(4); intList.add(5); intList.add(6); final Integer[] intArray = intList.toArray(new Integer[intList.size()]); System.out.println(Arrays.toString(intArray));
// Json
Reply With Quote