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13th Edition Volume 1 (Java SE 18 - 21)

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Section 10.5 Preview Note: Extent locals → Scoped values
Section 11.2: For example, the JUnit Test annotation → For example, the JUnit RepeatedTest annotation
Section 11.5.1: by calling the one of the methods → by calling one of the methods

13th Edition Volume 2 (Java SE 18 - 21)

Section 1.11

Change

Map<String, Integer> stateToCityPopulation = cities.collect(
   groupingBy(City::state, averagingInt(City::population)));

Map<String, Double> stateToCityPopulation = cities.collect(
   groupingBy(City::state, averagingInt(City::population)));

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