March 2019
Intermediate to advanced
242 pages
6h 21m
English
Content preview from Java 11 and 12 – New Features
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Limiting the scope of failed assumptions
As you know, the use of var types is limited to local variables in Java. They are not allowed in the public API, as method parameters or as the return type of methods. Some languages support type inference for all types of variables. Java may allow us to do so in the future, but we don't know when.
However, there are strong reasons for limiting the scope of the inferred variables, to spot the errors due to mismatch of assumptions and the actual, early on. The contracts of the public APIs should be explicit. Type inference with public APIs would allow for these errors to be caught and corrected much later.
The contract of the public APIs should be explicit; they shouldn't depend on type inference.
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