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                # Kotlin 程序:連接兩個列表 > 原文: [https://www.programiz.com/kotlin-programming/examples/join-two-lists](https://www.programiz.com/kotlin-programming/examples/join-two-lists) #### 在此程序中,您將學習在 Kotlin 中連接兩個列表的不同技術。 ## 示例 1:使用`addAll()`連接兩個列表 ```kt import java.util.ArrayList fun main(args: Array<String>) { val list1 = ArrayList<String>() list1.add("a") val list2 = ArrayList<String>() list2.add("b") val joined = ArrayList<String>() joined.addAll(list1) joined.addAll(list2) println("list1: $list1") println("list2: $list2") println("joined: $joined") } ``` 運行該程序時,輸出為: ```kt list1: [a] list2: [b] joined: [a, b] ``` 在以上程序中,我們使用`List`的`addAll()`方法將列表`list1`和`list2`連接到連接列表。 * * * ## 示例 2:使用`union()`連接兩個列表 ```kt import java.util.ArrayList; import org.apache.commons.collections.ListUtils; fun main(args: Array<String>) { val list1 = ArrayList<String>() list1.add("a") val list2 = ArrayList<String>() list2.add("b") val joined = ListUtils.union(list1, list2) println("list1: $list1") println("list2: $list2") println("joined: $joined") } ``` 該程序的輸出是相同的。 在上面的程序中,我們使用`union()`方法將給定列表連接到`joined`上。 這是等效的 Java 代碼:[連接兩個列表的 Java 程序](/java-programming/examples/join-two-lists "Java Program to join two lists")。
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