public class Rondom {
public static String genRandomNum(int card_len){
//35 0 ,26 +10
final int maxNum = 36;
int i; //
int count = 0; //
char[] str = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
StringBuffer pwd = new StringBuffer("");
Random r = new Random();
while(count < card_len){
// , ,
i = Math.abs(r.nextInt(maxNum)); // 36-1
if (i >= 0 && i < str.length) {
pwd.append(str[i]);
count ++;
}
}
return pwd.toString();
}
public static void main(String[] args) {
for(int l=0;l<100;l++){
System.out.println(genRandomNum(6));// 6
}
}
}