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Java Introduction to Functional Programming Reduction and Aggregation Reduce Housing Records

Posted by Radosław Kwiatkowski
Radosław Kwiatkowski
5,300 Points

Reducing operations challange problem.

I'm trying to solve this challange, and getting error "Non-static method cannot be referenced from a static context" at (String::length).

public static Optional<HousingRecord> getHighestValueIndexHousingRecordDeclaratively(List<HousingRecord> records) { // TODO: Create a stream off of the records // TODO: Find and return the maximum using a Comparator that compares the current home value index return records.stream() .map(HousingRecord::getCurrentHomeValueIndex) .max(Comparator.comparingInt(String::length)); }

1 Answer

Steven Parker
Steven Parker
229,644 Points
Steven Parker
Steven Parker
229,644 Points

Perhaps comparing the length of numbers is not the best way to determine which is larger. Try skipping the "map" and just getting the max by comparing the values directly.