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                ??一站式輕松地調用各大LLM模型接口,支持GPT4、智譜、豆包、星火、月之暗面及文生圖、文生視頻 廣告
                # 如何在 Java 中將所有`List`元素復制并添加到`ArrayList` > 原文: [https://beginnersbook.com/2013/12/how-to-copy-and-add-all-list-elements-to-arraylist-in-java/](https://beginnersbook.com/2013/12/how-to-copy-and-add-all-list-elements-to-arraylist-in-java/) 在本教程中,我們將了解如何將列表的所有元素復制并添加到`ArrayList`。為此,我們將使用`ArrayList`類的[`addAll method`](https://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#addAll(java.util.Collection))。 `public boolean addAll(Collection c)` 它將指定的`Collection` c 的所有元素添加到調用列表的末尾。如果指定的`Collection`為空,則拋出[`NullPointerException`](https://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html)。 ## 將`List`元素復制到`ArrayList`的完整示例 ```java package beginnersbook.com; import java.util.ArrayList; import java.util.List; public class ListToArrayListExample { public static void main(String a[]){ ArrayList<String> al = new ArrayList<String>(); //Adding elements to the ArrayList al.add("Text 1"); al.add("Text 2"); al.add("Text 3"); System.out.println("ArrayList Elements are: "+al); //Adding elements to a List List<String> list = new ArrayList<String>(); list.add("Text 4"); list.add("Text 5"); list.add("Text 6"); //Adding all lements of list to ArrayList using addAll al.addAll(list); System.out.println("Updated ArrayList Elements: "+al); } } ``` 輸出: ```java ArrayList Elements are: [Text 1, Text 2, Text 3] Updated ArrayList Elements: [Text 1, Text 2, Text 3, Text 4, Text 5, Text 6] ```
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