java 如何在java中对arraylist中的元素进行排序？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13852077/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to sort elements inside the arraylist in java?
提问by user1805605
Possible Duplicate:
How to sort an arraylist of objects java?
可能的重复：
如何对对象的数组列表进行排序 java？
I have an arraylist that contains very large details i want to sort the data alphabetically but there is no method in arraylist class for sort. Please Help?
我有一个包含非常大的细节的数组列表，我想按字母顺序对数据进行排序，但是在数组列表类中没有用于排序的方法。请帮忙？
回答by arshajii
Use Collections.sort, which is able to sort any List.
使用Collections.sort，它可以对任何List.
I'm assuming that you're talking about a list of strings, in which case you can simply call Collections.sorton your list to sort it alphabetically.
我假设您正在谈论一个字符串列表，在这种情况下，您可以简单地调用Collections.sort您的列表以按字母顺序对其进行排序。
If you're referring to a list of instances of a class you created with an internal string field then you have two options:
如果您指的是使用内部字符串字段创建的类的实例列表，那么您有两个选择：
Have the class implement the
Comparableinterface, then callCollections.sorton the list with no arguments other than the list itself.Write a custom
Comparatorthat works with your class, and pass an instance of it to thesortmethod as a second argument along with your list.
让类实现
Comparable接口，然后调用Collections.sort列表，除了列表本身之外没有任何参数。编写一个
Comparator适用于您的类的自定义，并将它的一个实例sort作为第二个参数与您的列表一起传递给该方法。
If alphabetical ordering is the 'natural' way in which instances of your class should be ordered, you should probably implement Comparable. If not, you should probably write a Comparator.
如果字母顺序是应该对类的实例进行排序的“自然”方式，那么您可能应该实现Comparable. 如果没有，您可能应该编写一个Comparator.
回答by OCJP
There is no sort method in arraylist But there is a sort method in Collections as ArrayList comes under the collections tree structure you can use the sort of method in collections.Here is the code Collections.sort(arrayList);
arraylist 中没有 sort 方法但是 Collections 中有一个 sort 方法，因为 ArrayList 属于 collections 树结构下，您可以使用 collections 中的 sort 方法。这是代码 Collections.sort(arrayList);
