生成流水号

   public static String getCodeOfFive(String prefix, int nowNum) {

        //需要返回的code
        StringBuilder codeSb = new StringBuilder();
        //需要拼接的数字
        StringBuilder numSb = new StringBuilder();
        //封装的数字对象，里面 value 加了 volatile关键字，保证了线程安全
        AtomicInteger count = new AtomicInteger(nowNum);

        //将数值补足为5位字符串
        numSb.append(String.format("%05d", count.get()));
        //先拼接前缀
        codeSb.append(prefix);
        //再拼接数字
        codeSb.append(numSb);
        return codeSb.toString();
    }

标签：String,StringBuilder,numSb,生成,流水号,codeSb,new,append
来源： https://www.cnblogs.com/mengzhao/p/14953716.html