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  1. import java.util.List;
  2. import java.util.stream.Collectors;
  3.  
  4. class Ideone {
  5. 	public static void main (String[] args) {
  6. 		List<Student> students = List.of(1.0, 2.0, 3.0, 4.0).stream()
  7. 				.map(Student::of)
  8. 				.collect(Collectors.toList());
  9.  
  10. 		System.out.println(sumScore(students));
  11. 	}
  12.  
  13. 	public static double sumScore(List<? extends Student> students) {
  14. 		return students.stream()
  15. 			.mapToDouble(Student::getScore)
  16. 			.sum();
  17. 	}
  18. }
  19.  
  20. class Student {
  21. 	final double score;
  22.  
  23. 	private Student(double score) {
  24. 		this.score = score;
  25. 	}
  26.  
  27. 	public static Student of(double score) {
  28. 		return new Student(score);
  29. 	}
  30.  
  31. 	public double getScore() {
  32. 		return score;
  33. 	}
  34. }
Success #stdin #stdout 0.08s 34496KB
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10.0
https://ideone.com/HgDfKo
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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