Here, we have created a string that contains numbers from 0 to 9 and the alphabets in uppercase and lowercase.įrom the string, we have randomly generated an alphanumeric string of length 10. Output Random Alphanumeric String is: pxg1Uzz9Ju Int index = random.nextInt(alphaNumeric.length()) Ĭhar randomChar = alphaNumeric.charAt(index) String alphaNumeric = upperAlphabet + lowerAlphabet + numbers String lowerAlphabet = "abcdefghijklmnopqrstuvwxyz" String upperAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" create a string of uppercase and lowercase characters and numbers Note: The output will be different every time you run the program.Įxample 2: Java Program to generate a random alphanumeric string import If we want to change the random string into lower case, we can use the toLowerCase() method of the String. ![]() We then used the StringBuilder class to append all the characters together. Using the random index number, we have generated the random character from the string alphabet. Next, we have generated a random index number using the nextInt() method of the Random class. allAlphaNumeric.charAt ( (int) Math.floor (52 Math. Initialize the first character for the random string. Declare a string to hold the random string. In the above example, we have first created a string containing all the alphabets. The approach to generate a random alpha-numeric String should not start with a number: Take all alpha-numeric characters (total 62) in a string. append the character to string builder Int index = random.nextInt(alphabet.length()) Ĭhar randomChar = alphabet.charAt(index) String alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" ![]() By following these best practices, you can ensure the security and randomness of the generated strings in your applications.Example 1: Java program to generate a random string import We also provided best practices for generating secure and random strings. In this guide, we explored different approaches for generating random strings in Java.
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