@SuppressWarnings("unchecked")
public <T> T[] toArray(T[] a) {
int sz = this.size;
return (T[])
ArrayTools.fill(
((a.length >= sz) ? a : ArrayTools.newInstance(a, sz)), 0, sz, this.getElement());
}
public Object[] toArray() {
return ArrayTools.fill(new Object[this.size], this.getElement());
}