public class TwoBridge implements Piece{
private HashSet<Hexagon>[] permutations;
public TwoBridge(){
permutations = new HashSet<Hexagon>[6];
Hi, I'm trying to create an array of Sets of hexagons (hexagons being a class i created).
However I get this error when I try to compile
oliver@oliver-desktop:~/uni/16/partB$ javac oadams_atroche/TwoBridge.java
oadams_atroche/TwoBridge.java:10: generic array creation
permutations = new HashSet<Hexagon>[6];
^
1 error
How can I resolve this?
You can't create arrays with generics. Use a Collection<Set<Hexagon>>
or (Array)List<Set<Hexagon>>
instead.
Here's the formal explanation .
You cannot. The best you can do is make an ArrayList<Set<Hexagon>>
.
If you are willing to deal with raw types (which are heavily discouraged), you can make an array of Set
(as opposed to Set<Hexagon>
, which is not allowed). But you didn't hear this from me.
Following will give you a warning: permutations = new HashSet[6];
However, I agree with Chris that it is better to use ArrayList instead of ordinary array.
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