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Java Stream - 如何sum a LongStream

我們想知道如何sum a LongStream。 
import java.util.stream.LongStream;

public class Main {
  public static void main(String...args){
    long l = LongStream.rangeClosed(1, 200).reduce(Long::sum).getAsLong();
    System.out.println(l);
  }
}