如何通过多个属性在java8的对象列表列表中排序 [英] how sort in java8 list of lists of object by multiple properties

问题描述

我知道这不是一个新问题，但是我想按java8中首选的列对CSV文件进行排序.

I know this is not a new question but I want to sort CSV file by Column preferred in java8.

CSV的数据结构为List<List<CsvEntity>，我需要首先按CsvEntity的一个字段进行排序，然后按其他(并非必须)示例进行排序:firstName然后按lastName.

The Data-structure of CSV is List<List<CsvEntity> I need to sort first by one field of the CsvEntity then by other (not must) example by: firstName then by lastName.

class CsvEntity{
   private String firstName
   private String lastName
   private String address
}

此之后-我需要进行哪些修改以支持Java8中对多个键的排序?

What modifications do I need to make for supporting sort on multiple keys in Java8?

推荐答案

只使用比较器，一个按firstName然后按lastName排序的示例

Just use comparator, an example of sorting by firstName then by lastName

list.forEach(l -> l.sort(Comparator.comparing(CsvEntity::getFirstName)
                               .thenComparing(CsvEntity::getLastName)));

当然，您必须为字段使用getter才能使用方法引用

Of course you have to have getters for your fields to use method reference

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