java随机生成6位不重复的字符串

public String getlinkNo() {String linkNo &＃61; "";// 用字符数组的方式随机String model &＃61; "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";char[] m &＃61; model.toCharArray();for (int j &＃61; 0; j <6; j&＃43;&＃43;) {char c &＃61; m[(int) (Math.random() * 36)];// 保证六位随机数之间没有重复的if (linkNo.contains(String.valueOf(c))) {j--;continue;}linkNo &＃61; linkNo &＃43; c;}return linkNo;
}