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                # 如何在 Java 中按降序對`ArrayList`進行排序 > 原文: [https://beginnersbook.com/2013/12/sort-arraylist-in-descending-order-in-java/](https://beginnersbook.com/2013/12/sort-arraylist-in-descending-order-in-java/) 之前我們分享了[`ArrayList`](https://beginnersbook.com/2013/12/how-to-sort-arraylist-in-java/)升序排序的例子。在這里,我們將學習如何按降序(或遞減順序)對`ArrayList`進行排序。 ## 示例:按降序排序 我們使用[`Collections.reverseOrder()`](https://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#reverseOrder())方法和`Collections.sort()`以按降序對列表進行排序。在下面的示例中,我們使用以下語句以相反的順序進行排序。 `Collections.sort(arraylist, Collections.reverseOrder());` 但是,逆序排序也可以如下進行 - 這樣列表將首先按升序排序,然后反轉。 ```java Collections.sort(list); Collections.reverse(list); ``` **完整的例子:** ```java import java.util.*; public class Details { public static void main(String args[]){ ArrayList<String> arraylist = new ArrayList<String>(); arraylist.add("AA"); arraylist.add("ZZ"); arraylist.add("CC"); arraylist.add("FF"); /*Unsorted List: ArrayList content before sorting*/ System.out.println("Before Sorting:"); for(String str: arraylist){ System.out.println(str); } /* Sorting in decreasing order*/ Collections.sort(arraylist, Collections.reverseOrder()); /* Sorted List in reverse order*/ System.out.println("ArrayList in descending order:"); for(String str: arraylist){ System.out.println(str); } } } ``` 輸出: ```java Before Sorting: AA ZZ CC FF ArrayList in descending order: ZZ FF CC AA ``` 在上面的例子中,我們使用 String 類型的`ArrayList`(`ArrayList&lt;String&gt;`)進行排序。同樣的排序方法也可以用于整數列表。
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