beforeFlatMapMethodReference.java

// "Replace Stream.flatMap().count() with Stream.mapToLong().sum()" "true"

import java.util.Collection;
import java.util.List;

public class Main {
  private String s;

  public Main(List<List<String>> s) {
    long count = s.stream().flatMap(Collection::stream).cou<caret>nt();
  }
}