Java / Groovy generic type inference

Question

I'm writing Groovy (1.8.8) code running under JDK6 and it seems the following is legal:

ConcurrentMap<Foo, Bar> statsRegistry = new ConcurrentHashMap<>()

Why is it permitted to omit the types on the right-hand side? Is this a NEW Groovy feature or would this also be allowed in Java 6?

Answer 1

Groovy 1.8中引入了“ diamond operator”（类型推断），请参阅发行说明中的​​这一项目 ，并且Groovy 1.8在JDK6上可以正常工作。