# 如何在 Java 中对`ArrayList`进行排序 > 原文： [https://beginnersbook.com/2013/12/how-to-sort-arraylist-in-java/](https://beginnersbook.com/2013/12/how-to-sort-arraylist-in-java/) 在本教程中，我们分享了对[`ArrayList<String>`](https://beginnersbook.com/2013/12/java-arraylist/)和`ArrayList<Integer>`进行排序的示例。 **另请阅读：** 1. [按降序排序`ArrayList`](https://beginnersbook.com/2013/12/sort-arraylist-in-descending-order-in-java/) 2. [使用`Comparable`和`Comparator`排序`ArrayList`的对象](https://beginnersbook.com/2013/12/java-arraylist-of-object-sort-example-comparable-and-comparator/) ## 示例 1：`ArrayList<String>`的排序 这里我们正在对`String`类型的`ArrayList`进行排序。我们只需调用`Collections.sort(arraylist)`方法即可。输出列表将按字母顺序排序。 ```java import java.util.*; public class Details { public static void main(String args[]){ ArrayList<String> listofcountries = new ArrayList<String>(); listofcountries.add("India"); listofcountries.add("US"); listofcountries.add("China"); listofcountries.add("Denmark"); /*Unsorted List*/ System.out.println("Before Sorting:"); for(String counter: listofcountries){ System.out.println(counter); } /* Sort statement*/ Collections.sort(listofcountries); /* Sorted List*/ System.out.println("After Sorting:"); for(String counter: listofcountries){ System.out.println(counter); } } } ``` 输出： ```java Before Sorting: India US China Denmark After Sorting: China Denmark India US ``` ## 示例 2：`ArrayList<Integer>`的排序 相同的[`Collections.sort()`](https://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#sort(java.util.List))方法也可用于对整数`ArrayList`进行排序。 ```java import java.util.*; public class ArrayListOfInteger { public static void main(String args[]){ ArrayList<Integer> arraylist = new ArrayList<Integer>(); arraylist.add(11); arraylist.add(2); arraylist.add(7); arraylist.add(3); /* ArrayList before the sorting*/ System.out.println("Before Sorting:"); for(int counter: arraylist){ System.out.println(counter); } /* Sorting of arraylist using Collections.sort*/ Collections.sort(arraylist); /* ArrayList after sorting*/ System.out.println("After Sorting:"); for(int counter: arraylist){ System.out.println(counter); } } } ``` 输出： ```java Before Sorting: 11 2 7 3 After Sorting: 2 3 7 11 ```