Hi Christopher,
<R> in Table has an upper bound of Record. This means, the following
two assignments are equivalent (tested in javac and with the Eclipse
compiler):
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List<Table<?>> tables = schema.getTables();
List<Table<? extends Record>> tables = schema.getTables();
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Just like
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Table<?> table = schema.getTable("ABC");
Table<? extends Record> table = schema.getTable("ABC");
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I'm actually not sure if there is a difference, generally... The
reason why I chose to omit repeating the upper bound of the generic
wildcard is to decrease API verbosity. Especially when using IDE
auto-completion, the bounded wild-card can become very annoying very
quickly
Cheers
Lukas
