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                # Java `String valueOf()`方法 > 原文: [https://beginnersbook.com/2017/10/java-string-valueof-method/](https://beginnersbook.com/2017/10/java-string-valueof-method/) Java `String valueOf()`方法返回`boolean`,`char`,`char`數組,`int`,`long`,`float`和`double`參數的`String`表示形式。對于每種類型的參數,我們有不同版本的此方法。 ## java 字符串`valueOf()`方法的不同變體 ```java public static String valueOf(boolean b): Used for converting boolean value to a String public static String valueOf(char c): char to String public static String valueOf(int i): int to String public static String valueOf(long l): long to String public static String valueOf(float f): float to String public static String valueOf(double d): double to String ``` ## Java `String valueOf()`簡單示例 讓我們舉一個簡單的例子來理解這種方法的用法。在這個例子中,我們將`double nines`連接到給定值的末尾。給定的值是一個整數,為了在整數的末尾附加 99,我們必須首先將給定的整數轉換為字符串。我們使用`valueOf()`方法將`number`轉換為等效字符串`str`,然后我們將 99 轉換并[連接](https://beginnersbook.com/2013/12/java-string-concat-method-example/) 到字符串末尾。 ```java public class JavaExample{ public static void main(String args[]){ int number = 23; String str = String.valueOf(number); System.out.println(str+99); } } ``` **輸出:** ![java string valueof method example](https://img.kancloud.cn/b7/b2/b7b2ebd16e020b42f855d745285e225a_722x476.jpg) ## 方法`valueOf()`示例 2 在此示例中,我們使用`valueOf()`方法將數組轉換為字符串。 ```java public class JavaExample{ public static void main(String args[]){ char vowel[] = {'A', 'E', 'I', 'O', 'U'}; String str = String.valueOf(vowel); System.out.println(str); } } ``` **輸出:** ![String valueOf() method in Java Example](https://img.kancloud.cn/b3/e9/b3e981ad4dbac8eedebd1f0973785741_752x490.jpg) ## Java `String valueOf()`示例 讓我們舉個例子,我們使用了`valueOf()`方法的所有變體。在這個例子中,我們使用`valueOf()`方法將`int`,`float`,`long`,`double`,`char`和`char`數組轉換為`String`。 ```java public class Example{ public static void main(String args[]){ int i = 10; //int value float f = 10.10f; //float value long l = 111L; //long value double d = 2222.22; //double value char ch = 'A'; //char value char array[] = {'a', 'b', 'c'}; //char array //converting int to String String str1 = String.valueOf(i); //converting float to String String str2 = String.valueOf(f); //converting long to String String str3 = String.valueOf(l); //converting double to String String str4 = String.valueOf(d); //converting char to String String str5 = String.valueOf(ch); //converting char array to String String str6 = String.valueOf(array); System.out.println(str1); System.out.println(str2); System.out.println(str3); System.out.println(str4); System.out.println(str5); System.out.println(str6); } } ``` **輸出:** ```java 10 10.1 111 2222.22 A abc ``` **參考:**[`String valueOf()`方法 - JavaDoc](https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#valueOf(boolean))
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