生成邀请码-个人笔记

public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            System.out.println(getCode());
        }

    }

    public static String getCode() {
        int count = 6;
        String str = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        StringBuilder sb = new StringBuilder();
        Random r = new Random(System.currentTimeMillis()+(long) (Math.random()*10000));
        for (int i = 0; i < count; i++) {
            int d = r.nextInt(62);
            sb.append(str.charAt(d));
        }
        return sb.toString();
    }

生成效果