# 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] ```