使用Apache Commons StringUtils。leftPad(或者查看代码来创建自己的函数)。

public class LeadingZerosExample {
    public static void main(String[] args) {
       int number = 1500;

       // String format below will add leading zeros (the %0 syntax) 
       // to the number above. 
       // The length of the formatted string will be 7 characters.

       String formatted = String.format("%07d", number);

       System.out.println("Number with leading zeros: " + formatted);
    }
}

public class PaddingLeft {
    public static void main(String[] args) {
        String input = "Apple";
        String result = "00000000" + input;
        int length = result.length();
        result = result.substring(length - 8, length);
        System.out.println(result);
    }
}

我相信这就是他真正想要的:

String.format("%0"+ (8 - "Apple".length() )+"d%s",0 ,"Apple"); 

输出:

000Apple

 StringUtils.leftPad(yourString, 8, '0');

这来自commons-lang。看到javadoc

String input = "Apple";
StringBuffer buf = new StringBuffer(input);

while (buf.length() < 8) {
  buf.insert(0, '0');
}

String output = buf.toString();