kata8

kata8

version of the Kata using Java 8 features

Toward Java 11

1. JEP 269 introduces convenient factory methods to create unmodifiable lists and maps. Rewrite ExprTest to use List.of(...) and Map.of(...) and remove the class TestHelper which is not needed anymore.

2. Java 11 adds a method String.lines() to the API. In ExprTests.parseAll(), the code can be simplified leveraging String.lines() instead of creating a StringReader and a BufferedReader.

3. JEP 213 allow private methods to be declared in interface. The class Expressions is not necessary anymore because the code of Expressions.parse(Iterator) can be moved into Expr.

4. JEP 286 introduces local variable type inference using 'var' so all local variable declarations can be rewritten using 'var'.

Once all these refactoring are done, you can continue with the migration to Java 17.