随机验证码（二）

public class Test {
 public static void main(String[] args) {
  String d = createRandom(6);
  System.out.println(d);
 }
 public static String createRandom(int length) {
  String retStr = "";
  for(int i=0;i<length;i++){
   int number = (int)(Math.random()*10);
   System.out.println("number ="+number );
   retStr += number ;
  }

  return retStr;
 }

}

结果：
number =0
number =3
number =4
number =9
number =6
number =6
034966