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                # java - 使用空格和零左填充字符串 > 原文: [https://beginnersbook.com/2014/07/java-left-padding-a-string-with-spaces-and-zeros/](https://beginnersbook.com/2014/07/java-left-padding-a-string-with-spaces-and-zeros/) 在本教程中,我們將看到如何使用空格和零來填充字符串: #### 1)使用空格左填充 ```java class LeftPaddingExample1 { public static void main(String[] args) { System.out.println("#" + padLeftSpaces("mystring", 10) + "@"); System.out.println("#" + padLeftSpaces("mystring", 15) + "@"); System.out.println("#" + padLeftSpaces("mystring", 20) + "@"); } public static String padLeftSpaces(String str, int n) { return String.format("%1$" + n + "s", str); } } ``` **輸出:** ```java # [email?protected] # [email?protected] # [email?protected] ``` #### 2)使用零左填充 ```java class LeftPaddingExample2 { public static void main(String[] args) { System.out.println("#" + padLeftZeros("mystring", 10) + "@"); System.out.println("#" + padLeftZeros("mystring", 15) + "@"); System.out.println("#" + padLeftZeros("mystring", 20) + "@"); } public static String padLeftZeros(String str, int n) { return String.format("%1$" + n + "s", str).replace(' ', '0'); } } ``` **輸出:** ```java #[email?protected] #[email?protected] #[email?protected] ```
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