How can i use toArray to transfer Set to Array ?

Question

Dear All,
Currently, I just can do it by the following code, is there any good idea ?
          Object[] object = set.toArray();
          int[] bb = new int[set.size()];
          for(int i=0; i<object.length; i++) {
               Object object_aa = object;
               bb[i] = Integer.parseInt(object_aa.toString());
Thank you very much

Answer 1

>      Object[] object = set.toArray();
     int[] bb = new int[set.size()];
     for(int i=0; i<object.length; i++) {
          Object object_aa = object;
          bb[i] = Integer.parseInt(object_aa.toString());
What type of objects are in your set? Are they String or Integer? You will have to do what you showed--converting each object one by one (or just iterate through the Set using an Iterator instead of using toArray, since you won't need the Object [] when you are done).
If they are String:
String[] stringArray = (String []) set.toArray(new String[set.size()]);then you won't need to call toString.
If they are Integer:
Integer[] integerArray = (Integer[]) set.toArray(new Integer[set.size()]);Then use integerArray.intValue to fill in
your int array.
Or:
int [] bb = new int[set.size()];
for (Iterator iter = set.iterator(), i=0;
       iter.hasNext(); i++)
   bb[i] = Integer.parseInt(iter.next().toString());
}where the middle parseInt and toString can be changed, depending on what type of object your set contains.
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