static class Thing
will make your program work.
As it is, you’ve got Thing
as an inner class, which (by definition) is associated with a particular instance of Hello
(even if it never uses or refers to it), which means it’s an error to say new Thing();
without having a particular Hello
instance in scope.
If you declare it as a static class instead, then it’s a “nested” class, which doesn’t need a particular Hello
instance.
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