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                # Java `String join()`方法 > 原文: [https://beginnersbook.com/2017/10/java-string-join-method/](https://beginnersbook.com/2017/10/java-string-join-method/) 在 Java 8 中,我們在 [Java `String`](https://beginnersbook.com/2013/12/java-strings/)類中有一個新的方法`join()`。Java `String join()`方法[連接給定的字符串](https://beginnersbook.com/2013/12/java-string-concat-method-example/)并返回連接的字符串。為了同樣的目的,Java 8 還引入了一個新的[`StringJoiner`類](https://beginnersbook.com/2017/10/java-8-stringjoiner/)。 ## Java String Join()方法簽名 ```java public static String join(CharSequence delimiter, CharSequence... elements) ``` 返回一個新的`String`,該`String`由`CharSequence`元素的副本組成,這些元素與指定的分隔符的副本連接在一起。 例如, ```java String message = String.join("-", "This", "is", "a", "String"); // message returned is: "This-is-a-String" ``` 此方法的第一個參數指定用于連接多個字符串的分隔符。 注意,如果元素為`null`,則添加`"null"`。 ## Java `String join()`示例 ```java public class Example{ public static void main(String args[]){ //The first argument to this method is the delimiter String str=String.join("^","You","are","Awesome"); System.out.println(str); } } ``` 輸出: ```java You^are^Awesome ``` ## Java `String join()`通過分隔符連接列表元素的示例 在這個例子中,我們使用`join()`方法通過分隔符連接`List`的元素。 ```java import java.util.List; import java.util.Arrays; public class Example{ public static void main(String args[]){ //Converting an array of String to the list List list<String> = Arrays.asList("Steve", "Rick", "Peter", "Abbey"); String names = String.join(" | ", list); System.out.println(names); } } ``` 輸出: ```java Steve | Rick | Peter | Abbey ``` #### 相關文章: 1. [Java `String concat()`示例](https://beginnersbook.com/2013/12/java-string-concat-method-example/) 2. [Java `substring()`示例](https://beginnersbook.com/2013/12/java-string-substring-method-example/) 3. [Java `String copyValueOf()`示例](https://beginnersbook.com/2013/12/java-string-copyvalueof-method-example/) 4. [Java `String intern()`示例](https://beginnersbook.com/2017/10/java-string-intern-method/) #### 參考 [`String join()`方法 - JavaDoc](https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#join-java.lang.CharSequence-java.lang.CharSequence...-)
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