Usage of StringUtils.leftPad

There is the following requirement to generate a serial number that starts with D and is followed by a 6-digit sequence number, such as D000001, D000002, D000003... How to deal with it, use StringUtils.leftPad in commons-lang3 to achieve:

 <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>3.8.1</version>
 </dependency>

package com.cjian;

import org.apache.commons.lang3.StringUtils;

/**
 * @Author: cjian
 * @Date: 2022/8/31 19:33
 * @Des:
 */
public class Test {
    public static void main(String[] args) {

        for (int i = 0; i < 10; i++) {
            System.out.println("D" + StringUtils.leftPad(i + "", 6, "0"));
        }
    }
}

D000000
D000001
D000002
D000003
D000004
D000005
D000006
D000007
D000008
D000009

Or, as some command-line returned messages require, spaces should be indented by entry:

package com.cjian;

import org.apache.commons.lang3.StringUtils;

/**
 * @Author: cjian
 * @Date: 2022/8/31 19:33
 * @Des:
 */
public class Test {
    public static void main(String[] args) {
        for (int i = 1; i < 5; i++) {
            System.out.println(i + ")");
            for (int j = 1; j < 5; j++) {
                //为了效果展示，使用-代替空格
                System.out.println(StringUtils.leftPad(j + ")", 4, "-"));
            }
        }
    }
}

1)
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--4)
2)
--1)
--2)
--3)
--4)
3)
--1)
--2)
--3)
--4)
4)
--1)
--2)
--3)
--4)