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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