java 生成顺序的流水号

package test.test;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.text.SimpleDateFormat;
import java.util.Date;

public class AutoBatchNumber {
    private final Logger logger= LoggerFactory.getLogger(this.getClass());
    private static String prefix ="ZD"; // 生成前缀
    private static int counter = 0; // 流水号计数器
    private static String timeCheck="20230901" ; // 时间验证


    public synchronized static String generate(String suffix) {
        StringBuilder stringBuilder=new StringBuilder();
        if(!timeCheck.contains(suffix)){
            System.out.println("--0-");
            counter=0;
            timeCheck=suffix;
        }
        counter++;
        //System.out.println("--1--"+String.format("%04d", counter));
        return stringBuilder.append(prefix).append(suffix).append(String.format("%04d", counter)).toString();
       // return prefix +time+ +suffix+String.format("%04d", counter); // 使用四位数字格式化流水号
    }

    public static void main(String[] args) {
        String suffix =new SimpleDateFormat("yyyyMMdd").format(new Date()); // 生成后缀
        //timeCheck=suffix;
        // 生成10个学号
        for (int i = 0; i < 10; i++) {
            String studentNumber = AutoBatchNumber.generate(suffix);
            System.out.println(studentNumber);
        }
//        String number="ZD202309060001";
//        System.out.println(number.length());
//        String old=number.substring(2,10);
//        System.out.println("old=="+old);
//        String lastChar = number.substring(10);
//        System.out.println("lastChar=="+lastChar);
//        Integer last=Integer.valueOf(lastChar)+1;
//        System.out.println("last=="+last);
//        System.out.println(String.format("%06d", 12345));
//        System.out.println(StringUtils.leftPad(last.toString(),4,"0"));   //000123
    }
}