java 8，按属性排序对象列表，不带自定义比较器 [英] java 8, Sort list of objects by attribute without custom comparator

问题描述

完成这项工作的最简洁方法是什么？

What is the cleanest short way to get this done ?

 class AnObject{
     Long  attr;
 }

 List<AnObject> list; 

我知道可以使用AnObject的自定义比较器来完成。对于这种情况，是不是已经开箱即用？种类

I know it can be done with custom comparator for AnObject. Isn't there something ready out of the box for such case ? kind of

 Collections.sort(list, X.attr ) ;

推荐答案

假设你确实有列表< AnObject> ，您只需要

Assuming you actually have a List<AnObject>, all you need is

list.sort(Comparator.comparing(a -> a.attr));

如果通过不使用公共字段而不是使用访问器方法来使代码清洁，则它变得更加清晰：

If you make you code clean by not using public fields, but accessor methods, it becomes even cleaner:

list.sort(Comparator.comparing(AnObject::getAttr));

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