随机生成九位数字

public static void main(String[] args) {

    Random random = new Random();
    String s = random.nextInt(999999999)+ "";
    StringBuffer stringBuffer = new StringBuffer();
    for (int i = 0; i < 9-s.length(); i++) {
        stringBuffer.append("0");
    }
    s=stringBuffer.toString()+s;

    System.out.println(s);


}