Question

I do not think I can convert the following:

List<B> c = new ArrayList<B>();
c.add(***);
object[] a = c.toArray();
B[] b = (B[])a; //How to cast a back to B[]?

How can I achieve this in Java?

Answer 1

The other answers show what to do if you really need to convert an Object[] – but there’s a better approach. Change your code to start with:

List<B> c = new ArrayList<B>();
c.add(***);
B[] b = c.toArray(new B[c.size()]);

Or:

List<B> c = new ArrayList<B>();
c.add(***);
B[] b = c.toArray(new B[0]);