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                # Java `ArrayList trimToSize()`方法 > 原文: [https://beginnersbook.com/2013/12/java-arraylist-trimtosize-method-example/](https://beginnersbook.com/2013/12/java-arraylist-trimtosize-method-example/) `trimToSize()` 方法用于內存優化。它將`ArrayList`的容量調整為當前列表大小。對于例如`arraylist`的容量為 15,但其中只有 5 個元素,在此`ArrayList`上調用`trimToSize()`方法會將容量從 15 更改為 5。 `public void trimToSize()` ### 例 在這里,我定義了容量為 50 的`ArrayList`。在添加了 10 個元素之后,我調用了`trimToSize()`方法,該方法將容量從 50 減少到 10(`arraylist`的當前大小)。 ```java package beginnersbook.com; import java.util.ArrayList; public class TrimExample { public static void main(String args[]) { ArrayList<Integer> arraylist = new ArrayList<Integer>(50); arraylist.add(1); arraylist.add(2); arraylist.add(3); arraylist.add(4); arraylist.add(5); arraylist.add(6); arraylist.add(7); arraylist.add(1); arraylist.add(1); arraylist.add(1); arraylist.trimToSize(); System.out.println(arraylist); } } ``` 輸出: ```java [1, 2, 3, 4, 5, 6, 7, 1, 1, 1] ```
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