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Thread: Java password generator program to generate 8 random integers

  1. #1
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    Question Java password generator program to generate 8 random integers

    So I'm trying to create a password generator that generates 8 random integers.

    48-57
    65-90
    97-122

    so basically any letter uppercase or lower case and numbers.

    I think I'm on the right track but I could really use some help. Please show me how this could be done.

    import java.util.Random;
    import java.util.*;
     
    public final class PasswordGenerator {
        public static final void main(String[] args) {
     
    int num, counter, randomNum;
    counter = 0;
    String password = "";
     
    while (counter < 8)
    {
      randomNum = (int)(Math.random()*100);
      if (randomNum => 65) 
        num = Random.range(97,122);
     
         else if...
    Last edited by Deep_4; November 7th, 2012 at 09:48 PM.


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: Password Generator?

    Hello Lizard,

    I'm not sure what you are trying to do here?

    Please give me an example output.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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    Default Re: Password Generator?

    aqT6wWT

    any combination of letters (uppercase) (lowercase) and numbers. The password should only 8 in length.

  4. #4
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    Default Re: Password Generator?

    Afternoon Lizard,

    How about this code?

    It's completely random. The generated password contains numbers from 0 to 9, keyboard charactor including lower & upper case A-Z.

    public class PasswordGenerator {
     
        /**
         * JavaProgrammingForums.com
         */
        public static int count, random, intOrChar, upperOrLower;
        public static char myChar;
        public static String lowerCase, password, finalPasswd;
     
        public static void main(String[] args) {
     
            while (count < 8) {
     
                // Integer or character
                intOrChar = (int) (Math.random() * 2);
     
                // if 0 then Integer
                if (intOrChar == 0) {
     
                    // Print random number 0-9
                    random = (int) (Math.random() * 9);
                    //System.out.print(random);
                    password = Integer.toString(random) + password;
     
                    // if 1 then character
                } else if (intOrChar == 1) {
     
                    // decide lower or upper case
                    upperOrLower = (int) (Math.random() * 2);
     
                    // if 0 then upper case
                    if (upperOrLower == 0) {
     
                        // Print random Capital char
                        random = (int) (Math.random() * 74);
                        myChar = (char) (random + '0');
                        //System.out.print(myChar);
                        password = Character.toString(myChar) + password;
     
                        // if 1 then lower case
                    } else if (upperOrLower == 1) {
     
                        // Print random Small char
                        random = (int) (Math.random() * 74);
                        myChar = (char) (random + '0');
                        lowerCase = Character.toString(myChar).toLowerCase() + password;
                        //System.out.print(lowerCase);
                        password = lowerCase;
     
                    }
     
                }
     
                count++;
            }
            finalPasswd = password.replace("null", "");
            System.out.println(finalPasswd);
        }
     
    }
    Example output:

    e05A34z5
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