APETYPE/practice
java·passage intermediate
java·passage intermediateDesktop Required to Type
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import java.util.List;↵
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import java.util.Map;↵
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import java.util.stream.Collectors;↵
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↵
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public record Transaction(String currency, double amount) {}↵
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↵
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public class Analytics {↵
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public static Map<String, Double> summarize(List<Transaction> items) {↵
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return items.stream()↵
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.filter(t -> t.amount() > 0)↵
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.collect(Collectors.groupingBy(↵
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Transaction::currency,↵
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Collectors.summingDouble(Transaction::amount)↵
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));↵
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}↵
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}
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