임시번호 생성(JAVA) 방법

String randomPwd = _getRandomPassword(10)



private String _getRandomPassword(int len){
char[] charSet = new char[] {''0,'1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'}
int idx = 0;
StringBuffer sb = new StringBuffer();
for(int i = 0; i < len; i++){
idx = (int) (charSet.length * Math.random());
sb.append(charSet[idx]);
}
return sb.toString();
}