Java生成随机字母和数字

转自：http://holdbelief.javaeye.com/blog/340414

 

public String getCharacterAndNumber(int length){ String val = ""; Random random = new Random(); for(int i = 0; i < length; i++) { String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num"; // 输出字母还是数字 if("char".equalsIgnoreCase(charOrNum)) // 字符串 { int choice = random.nextInt(2) % 2 == 0 ? 65 : 97; //取得大写字母还是小写字母 val += (char) (choice + random.nextInt(26)); } else if("num".equalsIgnoreCase(charOrNum)) // 数字 { val += String.valueOf(random.nextInt(10)); } } return val;}