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package utilities; import java.util.Random; public class RandomString { // Random number private static final String CHAR_LIST = "0123456789"; /* Use the below String to random chars, numbers or both. private static final String CHAR_LIST = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; private static final String CHAR_LIST = "1234567890"; private static final String CHAR_LIST = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; */ private static final int RANDOM_STRING_LENGTH = 15; public String generateRandomString() { StringBuffer randStr = new StringBuffer(); for(int i=0; i<RANDOM_STRING_LENGTH; i++) { int number = getRandomNumber(); char ch = CHAR_LIST.charAt(number); randStr.append(ch); } return randStr.toString(); } private int getRandomNumber() { int randomInt = 0; Random randomGenerator = new Random(); randomInt = randomGenerator.nextInt(CHAR_LIST.length()); if (randomInt - 1 == -1) { return randomInt; } else { return randomInt - 1; } } public static void main(String[] args) { RandomString ramdomNumber = new RandomString(); System.out.println(ramdomNumber.generateRandomString()); // System.out.println(ramdomEmail.generateRandomString()+"@sangbui.com"); } } |
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