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                # Java - `String copyValueOf()`方法 > 原文: [https://beginnersbook.com/2013/12/java-string-copyvalueof-method-example/](https://beginnersbook.com/2013/12/java-string-copyvalueof-method-example/) 方法`copyValueOf()`用于將字符數組復制到`String`。這里需要注意的是,此方法不會將內容附加到`String`中,而是將現有的字符串值替換為數組的字符序列。 它有兩個變種: 1)`static copyValueOf(char[] data)`:它將整個數組(數據)復制到字符串。 2)`static String copyValueOf(char[] data, int offset, int count)`:它使用指定的偏移量和計數值僅將指定的字符復制到字符串。`offset`是需要復制字符的初始索引,`count`是要復制的字符數。對于例如`offset` 2 和`count` 3 將被解釋為:數組從第 2 個索引開始的僅僅 3 個字符(第 3 個位置因為索引從 0 開始)應該被復制到相關的`String`。 ### 例 在這個例子中,我們有兩個字符串`str1`和`str2`和一個名為`data`的字符數組。我們使用方法`copyValueOf()`的變體將數組復制到字符串。 ```java public class CopyValueOfExample { public static void main(String args[]) { char[] data = {'a','b','c','d','e','f','g','h','i','j','k'}; String str1 = "Text"; String str2 = "String"; //Variation 1:String copyValueOf(char[] data) str1 = str1.copyValueOf(data); System.out.println("str1 after copy: " + str1); //Variation 2:String copyValueOf(char[] data,int offset,int count) str2 = str2.copyValueOf(data, 5, 3 ); System.out.println("str2 after copy: " + str2); } } ``` 輸出: ```java str1 after copy: abcdefghijk str2 after copy: fgh ```
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