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Java - generate random string of size n characters
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In this article, we would like to show you how to generate random string of size n characters in Java.
The following example presents how to generate random string of size n=10 using characters taken from ALPHABET constant.
Practical example:
xxxxxxxxxx1
package tmpOperations3;2
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import java.security.SecureRandom;4
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public class Example {6
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static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +8
"abcdefghijklmnopqrstuvwxyz" +9
"0123456789";10
static SecureRandom random = new SecureRandom();11
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static String randomString(int len) {13
StringBuilder sb = new StringBuilder(len);14
for (int i = 0; i < len; i++)15
sb.append(ALPHABET.charAt(random.nextInt(ALPHABET.length())));16
return sb.toString();17
}18
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public static void main(String[] args) {20
int n = 10;21
System.out.println(randomString(n));22
}23
}Example output:
xxxxxxxxxx1
nmAlwCyp75