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up vote 0 down vote favorite

I have a int array with 2 number. I wan to copy this number into array list and print them out. as much as possible refrain from using Integer result[];

  int result[] = {1024,2048};
  List<Integer> res = new ArrayList<Integer>(result);


public class TEA {

    /**
     * @param args
     */
    public static void main(String[] args) {

          int result[] = {1024,2048};
          List<int[]> res = Arrays.asList(result);
          System.out.println(res);


    }

}

output :[[I@3312b1dd]

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2 Answers 2

up vote 1 down vote accepted

If you can't make result into an Integer[] instead of an int[], your options are either to do an explicit for loop:

List<Integer> list = new ArrayList<Integer>();
for (int value : array) {
  list.add(value);
}

...or, if you can use third-party libraries, use Guava's Ints.asList(int[]). That's more or less the entire space of your options.

share|improve this answer
    
this is to add in new value,so it is not possible to copy existing array without using Integer result[]? –  newbieprogrammer May 10 '13 at 16:59
    
...I'm not sure what you're saying. These are essentially the only options if you want to get an int[] to a List<Integer>, but it's not clear what you mean by "this is to add in new value." –  Louis Wasserman May 10 '13 at 17:02
    
oh i got it..thanks p.s. saw the wrong codes just now. –  newbieprogrammer May 10 '13 at 17:17
up vote 0 down vote

Use Arrays.asList() method to do the same.

List<Integer> res = Arrays.asList(result);

This is a list view of the array, you can't add or delete elements.

List<Integer> res = new ArrayList<Integer>(Arrays.asList(result));

Copies all elements from the source array into a new list.

EDITED:

There is no automatic conversion from array of primitive type to array of their wrapper reference types. 

int result[] = {1024,2048};
List<Integer> list = new ArrayList<Integer>();
for (int value : result) {
    list.add(value);
}
System.out.println(list);
share|improve this answer
    
not working for both...i getting error, i also tired changing integer to int[], it return some rubbish value –  newbieprogrammer May 10 '13 at 16:45
    
What error ????? –  NINCOMPOOP May 10 '13 at 16:45
    
Exception in thread "main" java.lang.Error: Unresolved compilation problem: Type mismatch: cannot convert from List<int[]> to List<Integer> at TEA.main(TEA.java:74) –  newbieprogrammer May 10 '13 at 16:46
    
Can you post your entire code !!! –  NINCOMPOOP May 10 '13 at 16:52
    
posted.if i use Integer i get error as above –  newbieprogrammer May 10 '13 at 17:02

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