Creating an Array based on values in an ArrayList

Question

How can I create an Array object which its values need to be obtained by iterating through an ArrayList and getting them one by one.
In Detail:
- I have an ArrayList of a StudentInfo object
- Each StudentInfo contains an 'age' attribute.
- I want to iterate through the ArrayList, retrieve each StudentInfo object, get
the value of its age attribute and add it to the Array.
Something like this:
Integer[ ] ageNumbers;
StudentInfo myStudentInfo= new StudentInfo ();
for (Iterator it = myStudentInfo.iterator (); it.hasNext (); ) {
myStudentInfo = (StudentInfo)it.next();
myStudentInfo.getAge(); // this is where I�m stock, not sure how to add this
value to my ageNumbers array.
Thanks very much for the help!

Answer 1

But which is the ArrayList containing your StudentInfo ?
StudentInfo contain information about only one student ?
In this case
ArrayList allstudents = retrieve all students....
Integer[] ageNumber = new Integer(allstudent.size());
for(int i=0; i< allstudents.size(); i++) {
  StudentInfo student = (StudentInfo)allstudents.get(i);
  ageNumber[i] = student.getAge();
}