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                # Java `ArrayList addAll(Collection c)`方法 > 原文: [https://beginnersbook.com/2013/12/java-arraylist-addallcollection-c-method-example/](https://beginnersbook.com/2013/12/java-arraylist-addallcollection-c-method-example/) 在本教程中,我們將看到`java.util.ArrayList class`的`addAll()`方法的用法。此方法用于將列表的所有元素添加到另一個列表。 `public boolean addAll(Collection c)` 它將指定`Collection c`的所有元素添加到當前列表中。 ### 例 在這個例子中,我們使用`addAll()`方法將`arraylist`的所有元素添加到另一個`arraylist`。 ```java package beginnersbook.com; import java.util.ArrayList; public class ExampleOfaddAll { public static void main(String[] args) { // ArrayList1 of String type ArrayList<String> al = new ArrayList<String>(); al.add("Hi"); al.add("hello"); al.add("String"); al.add("Test"); System.out.println("ArrayList1 before addAll:"+al); //ArrayList2 of String Type ArrayList<String> al2 = new ArrayList<String>(); al2.add("Text1"); al2.add("Text2"); al2.add("Text3"); al2.add("Text4"); //Adding ArrayList2 into ArrayList1 al.addAll(al2); System.out.println("ArrayList1 after addAll:"+al); } } ``` 輸出: ```java ArrayList1 before addAll:[Hi, hello, String, Test] ArrayList1 after addAll:[Hi, hello, String, Test, Text1, Text2, Text3, Text4] ``` #### 參考: [`ArrayList.addAll(Collection c)`](https://docs.oracle.com/javase/6/docs/api/java/util/(java.util.Collection))
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