如何在Java中生成一个随机字符串 [英] How to generate a random String in Java

问题描述

我有一个对象 Student ，它有 studentName ， studentId ， studentAddress 等。对于 studentId ，我必须生成由七个数字charaters，
eg。

I have an object called Student, and it has studentName, studentId, studentAddress, etc. For the studentId, I have to generate random string consist of seven numeric charaters, eg.

studentId = getRandomId();
studentId = "1234567" <-- from the random generator.

我必须确保没有重复的ID。

And I have to make sure that there is no duplicate id.

推荐答案

生成随机字符串很容易 - 只需使用 java.util.Random 所有你想要的字符，例如

Generating a random string of characters is easy - just use java.util.Random and a string containing all the characters you want to be available, e.g.

public static String generateString(Random rng, String characters, int length)
{
    char[] text = new char[length];
    for (int i = 0; i < length; i++)
    {
        text[i] = characters.charAt(rng.nextInt(characters.length()));
    }
    return new String(text);
}

现在，为了唯一性，您需要将生成的字符串存储在某个地方。你如何做才真正取决于你的应用程序的其余部分。

Now, for uniqueness you'll need to store the generated strings somewhere. How you do that will really depend on the rest of your application.

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