Convert collection to Array
Object[] toArray()- Returns an array containing all of the elements in this collection.
<T> T[] toArray(T[] a)- Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
import java.util.ArrayList;
import java.util.Collection;
public class Main {
public static void main(String args[]) {
Collection collection = new ArrayList();
collection.add("java2s.com");
collection.add("j a v a 2 s.com");
collection.add("j a v a 2 s . com");
collection.add("j a v a 2 s . c o m");
Object[] array = collection.toArray();
System.out.println(array.length);
}
}
The output:
4