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Generic array casting java?
I have an assignment where we are to create a LinkedList class from scratch, implementing a given interface. This interface gives us the method public E[] toArray()
I cannot get the casting to work, when I test in JUnit using Integer objects the cast fails.
I initialize my array as E[] array = (E[]) new Object[howManyINeed]
How do I get this to work?
It is in an assignment and other people have gotten it to function so obviously there is a way to do it
3 Answers
- husoskiLv 75 years ago
You can do that, but not without getting an unchecked cast warning. There way that Java generics are defined, there is no truly type-safe way to do this; which is why the expected syntax of "new E[size]" is specifically disallowed when E is a parameterized type.
Try running your code, despite the warning, and it should be okay.
One way to eliminate the warning is to use the @SuppressWarnings annotation before the constructor or method containing the problem, like:
@SuppressWarnings({"unchecked"})
public TheList(int n) {
data = (E[]) new Object[n];
}
See the full sample at:
- Anonymous5 years ago
no
