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                # 如何在 java 中連接/組合兩個`ArrayList` > 原文: [https://beginnersbook.com/2013/12/how-to-joincombine-two-arraylists-in-java/](https://beginnersbook.com/2013/12/how-to-joincombine-two-arraylists-in-java/) 在本教程中,我們將了解如何在 Java 中**連接(或組合)兩個`ArrayList`。我們將使用[`addAll()`](https://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html#addAll(java.util.Collection))方法在最后一個`ArrayList`中連接兩個 ArrayLists。** #### 示例: 在這個例子中,我們將兩個`ArrayList`合并在一個`ArrayList`中,然后顯示最終`List`的元素。 ```java package beginnersbook.com; import java.util.ArrayList; public class Details { public static void main(String [] args) { //First ArrayList ArrayList<String> arraylist1=new ArrayList<String>(); arraylist1.add("AL1: E1"); arraylist1.add("AL1: E2"); arraylist1.add("AL1: E3"); //Second ArrayList ArrayList<String> arraylist2=new ArrayList<String>(); arraylist2.add("AL2: E1"); arraylist2.add("AL2: E2"); arraylist2.add("AL2: E3"); //New ArrayList ArrayList<String> al= new ArrayList<String>(); al.addAll(arraylist1); al.addAll(arraylist2); //Displaying elements of the joined ArrayList for(String temp: al){ System.out.println(temp); } } } ``` 輸出: ```java AL1: E1 AL1: E2 AL1: E3 AL2: E1 AL2: E2 AL2: E3 ```
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