I was reading through some JMockit examples and found this code:
final List<OrderItem> actualItems = new ArrayLis开发者_开发知识库t<~>();
What does the tilde in the generic identifier mean? I know it's the unary bitwise NOT operator, but I don't see an operand here.
Also, I tried compiling it and got an error. Am I just missing something?
It is just a shorthand for "same as in declaration".
Some IDEs, e.g. IntelliJ use this too.
The files on disk do not have this notation, which is only a compaction in the IDE GUI.
If there wasn't a tilde, I'd say, the code was already Java 7. Java 7 allows the diamond operator so this is/will be legal Java code:
Map<String, List<String>> map = new HashMap<>();
(but - no tilde with this syntax)
In IntelliJ IDEA, the ~
here:
Set<String> associations = new LinkedHashSet<~>();
means String
, which is the same as in the declaration on the left side.
I think that is shorthand to mean whatever the type is, in this case OrderItem.
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