![]() This method follows a similar approach as the above method in that a super set of all the characters is created, a random index is generated and character at that index is used to create the final string.īut this approach uses class to generate a random index. ![]() ![]() Output of above program executed thrice is RandomString.append(allCharacters.charAt(randomIndex)) retrieve character at index and add it to result Int randomIndex = (int)(Math.random() * allCharacters.length()) generate a random number between 0 and length of all characters StringBuffer randomString = new StringBuffer() String allCharacters = alphabetsInLowerCase + alphabetsInUpperCase + numbers String alphabetsInLowerCase = "abcdefghijklmnopqrstuvwxyz" String alphabetsInUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" Extract the character from the string in Step 2 at the index of number generated in Step 4 and add it to the string in Step 1.Īfter the loop completes, string in Step 1 will be a random string.In every iteration, generate a random number between 0 and the length of super set.Initiate a loop for with count equal to the length of random string required.Create a combination of upper and lower case alphabets and numerals to create a super set of characters.Initialize an empty string to hold the result.Random string of 8 characters is: 923ed6ecįollowing algorithm can be used to generate a random alphanumeric string of fixed length using this method.
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