How to randomly generate non-repeating strings in java

Can be implemented using the random() function and valueOf() function.

The random() method is used to return a random number, the range of random numbers is 0.0 =< Math.random < 1.0.

valueOf(char c): method is used to return the string representation of the char parameter.

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The specific code is as follows:

public String getlinkNo() {
    String linkNo = "";
    // 用字符数组的方式随机
    String model = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    char[] m = model.toCharArray();
    for (int j = 0; j < 6; j++) {
        char c = 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 = linkNo + c;
    }
    return linkNo;
}

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