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Object arrays are inferior to collections in almost every way. Prefer `Set`,
`List`, or `Multiset` over an object array whenever possible.
A few of these issues are covered, in much greater detail, in
[Effective Java Item 28: Prefer lists to arrays][ej3e-28].
# Method Parameters
Don't use object arrays as method parameters:
```java
public void createUsers(User[] users) { ... }
```
Use an `Iterable` instead:
```java
public void createUsers(Iterable<User> users) { ... }
```
# Return Values
Don't use object arrays as method return values:
```java
public User[] loadUsers() { ... }
```
Use an `ImmutableList` (or `ImmutableSet`) instead:
```java
public ImmutableList<User> loadUsers() { ... }
```
# Additional Alternatives
If you have a 2-dimensional array (e.g., `Foo[][]`), consider using an
`ImmutableTable<Integer, Integer, Foo>` instead.
[ej3e-28]: https://books.google.com/books?id=BIpDDwAAQBAJ
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