小编Abr*_*old的帖子

我有一个像下面这样的课程，

public class Inventory {

   private String name;
   private List<Sample> samples;
}

public class Sample {

   private int count;
   private String date;
}

List<Inventory> inventories;

我已经samples按日期排序了。没关系。但我需要按 Sample 类中的字段inventories对列表进行排序date。samples已经排序了。所以我需要库存按样品日期 DESC 排序。例如，

在该inventories列表中，如果有 3 个数据，

Inventory 1
name = 1
samples has dates of = List of (2021-07-02, 2021-07-03)

Inventory 2
name = 2
samples has dates of = List of (2021-07-02, 2021-09-03, 2021-10-03)

Inventory 3
name = 3
samples has dates …