Java 8 - 填充 ArrayList
有没有更好的方法来填充像这样的 ArrayList(我在 Java 7 中已经这样做了):
Is there a better way to fill an ArrayList like this (I have done it like this in Java 7):
List<ScheduleIntervalContainer> scheduleIntervalContainers = new ArrayList<>();
scheduleIntervalContainers.add(scheduleIntervalContainer);
推荐答案
为了填充一个List，可以使用Streamhttps://docs.oracle.com/javase/8/docs/api/java/util/stream/Stream.html#generate-java.util.function.Supplier-">Stream.generate(s) 然后使用 limit(maxSize).
To fill a List, it is possible to generate an infinite Stream using Stream.generate(s) and then limit the number of results with limit(maxSize).
例如，要填充 10 个新 ScheduleIntervalContainer 对象的 List:
For example, to fill a List of 10 new ScheduleIntervalContainer objects:
List<ScheduleIntervalContainer> scheduleIntervalContainers =
Stream.generate(ScheduleIntervalContainer::new).limit(10).collect(toList());
generate 方法采用 Supplier:在这种情况下，supplier 是每次创建 ScheduleIntervalContainer 的新实例的方法引用.
The generate method takes a Supplier: in this case, the supplier is a method reference creating new instance of ScheduleIntervalContainer each time.
相关文章