Unable to understand toArray()

[Maitri Solanki]

import java.util.*;
public class testToArray {
	public static void main(String[] args){
		List<Integer> iL = new ArrayList<Integer>();
		for(int x=0; x<3; x++){
			iL.add(x);
		}
		Object[] oa= iL.toArray();
		Integer[] ia2= new Integer[1];
		ia2=iL.toArray(ia2);                                                #1
		for(int i:ia2)
			System.out.println(i);                   // output: 0 1 2
			
		System.out.println(iL);                         // output: [0,1,2]
	}
}

The above program works fine and produces the output as mentioned.
The size of array "ia2" is smaller than the size of the list "iL", then how can the list elements fit into that array?
Why line #1 is not generating compilation error or an exception?

[Edit: added code tags]

[Henry Wong]

Take a look at the JavaDoc for ArrayList again. The toArray(array) method only returns the original array if the elements fit. If it doesn't, it allocates a new array.

Henry