About Question enthuware.ocpjp.ii.v11.2.1886 :
Posted: Wed Aug 14, 2019 10:13 pm
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class Book {
double price;
String title;
public double getPrice(){....}
//constructors and setters
}
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double d = books.stream().flatMap(bs -> bs.stream()).map(book -> book.getPrice()).sum();
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cannot find symbol
symbol: method sum()
location: interface Stream<Double>
I knew that autoboxing was expensive in stream, but I need help explain why this happens.