如何在 Java 中生成随机字符串

时间:2023-04-07
本文介绍了如何在 Java 中生成随机字符串的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

问题描述

我有一个名为 Student 的对象,它有 studentNamestudentIdstudentAddress 等.studentId,我必须生成由七个数字字符组成的随机字符串,例如.

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.

而且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

生成一个随机字符串很容易 - 只需使用 java.util.Random 和一个包含您想要的所有字符的字符串可用,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处.您如何做到这一点实际上取决于您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.

这篇关于如何在 Java 中生成随机字符串的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

上一篇:用java中的char变量计算 下一篇:如何在java中将4字节数组转换为浮点数

相关文章