What happens when a default method is hidden and inaccessible?
When overloading a Java method, be careful to specify the appropriate return types.
Is a list unmodifiable? Is it immutable? What about the views of the list?
The trick is to visualize how stream elements travel along the pipeline.
The average, sum, and count methods are trickier than they might seem.
Some acceptable shortcuts for annotations are inconsistent with Java’s usual syntax.