Random String Generation in Java

import java.util.Random;

public class RandomStringGen {


private static final String CHAR_LIST =
       "1234567890";
   private static final int RANDOM_STRING_LENGTH = 4;
   
   /**
    * This method generates random string
    * @return
    */
   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();
   }
   
   /**
    * This method generates random numbers
    * @return int
    */
   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;
       }
   }
   

}

Author : Nectar Websoft

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