Java8：从列表中对象的特定字段中选择最小值

Question

Suppose to have a class Obj

class Obj{

  int field;
}

and that you have a list of Obj instances, ie List<Obj> lst .

Now, how can I find in Java8 the minimum value of the int fields field from the objects in list lst ?

Answer 1

   list.stream().min((o1,o2) -> Integer.compare(o1.field,o2.field))

Brian Goetz的评论提供了更好的解决方案

list.stream().min(Comparator.comparingInt(Obj::getField)) 

Answer 2

你也可以

int min = list.stream().mapToInt(Obj::getField).min();