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Why a lambda expression inside the map method don't working, when terminal operation is the count an

Alexey Che
Member Posts: 1
Good day.
I don't understand why a lambda expression inside the map method don't working, when terminal operation is the count and a stream was generated from an ArrayList?
Here is a simplified snippet:
java.util.List<Integer> data = new ArrayList<>(); for(int i = 0; i < 4000; i++) { data.add(i); } data.stream().map(a -> { System.out.println(a);//NEWER CALLED return a+1;}).count();
I am on Windows 10, my java version is:
javac -versionjavac 11.0.1java -versionjava version "11.0.1" 2018-10-16 LTSJava(TM) SE Runtime Environment 18.9 (build 11.0.1+13-LTS)Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.1+13-LTS, mixed mode)
Regards,
Alexey.