Tuesday, October 15, 2013

toArray Dynamic behaviour

public class ToArrayTest {

public static void main(String[] args) {

ArrayList<String> arrayList = new ArrayList<String>();

//what happens here??, since I have allocated new String[0] for single element, will it return single element or all elements ??
String[] array = arrayList.toArray(new String[0]); 


Output:  4

As per spec, it's going to create a new array, if it does not fit in.
Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array. If the list fits in the specified array, it is returned therein. Otherwise, a new array is allocated with the runtime type of the specified array and the size of this list. 

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