ArrayList Debugging Activity 2
When working with ArrayList, you will sometimes want to obtain an actual array that contains the contents of the list. As explained earlier, you can do this by calling toArray( ).
Reasons why you might want to convert a collection into an array:
- To obtain faster processing times for certain operations.
- To pass an array to a method that is not overloaded to accept a collection.
- To integrate newer, collection-based code with legacy code that does not understand collections.
Whatever the reason, converting an ArrayList to an array is a trivial matter. The following program shows how:
// get array
Object ia[] = al.toArray();
int sum = 0;
// sum the array
for(int i=0; i<ia.length; i++){
sum += ((Integer) ia[i]).intValue();
}
System.out.println("Sum is: " + sum);
What happens now?
Your mission, if you choose to accept it, is to take the code you submitted for the last activity and after all the changes are done, convert the ArrayList to an Array and output the contents of the array.