Thread: This program works but Want to improve

my code is a very basic password generator i was wondering if i could do something to blow my computer science teachers mind away. this code only took about 25 minutes to right up i built the base and was looking for great ideas on what i could do

 
// The "PasswordGenerator" class.
import hsa.Stdin;
import java.util.Random;
public class PasswordGenerator
{
    public static void main (String[] args)
    {
        //declaring variables
        boolean end = false;
        String passLetters = "ABCDWFGHIJKLMNOPQRSTUVWXYZ";
        int numOfPassLetters, numOfPassNumbers, numOfPasswordsGenerated;
        Random myRandom = new Random ();
 
        System.out.println ("RANDOM PASSWORD GENERATOR\n");
        do
        {
            System.out.print ("\nEnter the number of letters you want in your pasword: ");
            numOfPassLetters = Stdin.readInt ();
            System.out.print ("\nEnter the number of numbers you want in your password: ");
            numOfPassNumbers = Stdin.readInt ();
            System.out.print ("\nEnter How many Passwords that you want to display to choose from: ");
            numOfPasswordsGenerated = Stdin.readInt ();
            // number of passwords Generated 
            for (int numOfPasswords = 0 ; numOfPasswords < numOfPasswordsGenerated ; numOfPasswords++) 
            {   //number of letter in each password
                for (int numOfLetters = 0 ; numOfLetters < numOfPassLetters ; numOfLetters++)
                {
                    int letterSelecter = myRandom.nextInt (25) + 1;
                    System.out.print (passLetters.substring (letterSelecter, letterSelecter + 1));
                }//numbr of numbers placed in each password
                for (int numOfNumbers = 0 ; numOfNumbers < numOfPassNumbers ; numOfNumbers++)
                {
                    int numberSelector = myRandom.nextInt (9);
                    System.out.print (numberSelector);
                }
                System.out.print ("\n\n");
            }
            System.out.print ("Would you like to generate more passwords? type 1 to generate more\nEnter 2 to stop: ");
            int determineEnd = Stdin.readInt ();
            if (determineEnd == 2)
            {
                System.out.println ("\nProgram will now Terminate");
                end = true;
            }
        }
        while (end == false);
 
 
    } // main method
} // PasswordGenerator class

i would rather use Scanner class for your input. Also, you could probably do a shuffle() method (or use the shuffle() method from Collections class) so that your numbers and letters are jumbled up instead of being predictable

I atempted to do what was asked and incountered a few errors can anyone tell me how to fix this so it works?

 
/*
* im trying to do this to allow mulitiple choices it wont tske it a i dont know how to fic it
                if (passSize == 1)
                {
                     letterSelecter = myRandom.nextInt (25) + 1;
                    passLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
                }
                if (passSize == 2)
                {
                     letterSelecter = myRandom.nextInt (25) + 1;
                    passLetters = "abcdefghijklmnopqrstuvwxyz";
                }
                if (passSize == 3)
                {
                     letterSelecter = myRandom.nextInt (51) + 1;
                    passLetters = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz";
                }
*/
// The "PasswordGenerator" class.
import hsa.Stdin;
import java.util.Random;
public class PasswordGenerator
{
    public static void main (String[] args)
    {
        //declaring variables
        boolean end = false;
        String passLetters;
        int numOfPassLetters, numOfPassNumbers, numOfPasswordsGenerated,letterSelecter;
        Random myRandom = new Random ();
 
        System.out.println ("RANDOM PASSWORD GENERATOR\n");
        do
        {
            System.out.print ("\nEnter 1 for all caps, 2 for all lower cased and 3 for both");
            int passSize = Stdin.readInt ();
 
            System.out.print ("\nEnter the number of letters you want in your pasword: ");
            numOfPassLetters = Stdin.readInt ();
            System.out.print ("\nEnter the number of numbers you want in your password: ");
            numOfPassNumbers = Stdin.readInt ();
            System.out.print ("\nEnter How many Passwords that you want to display to choose from: ");
            numOfPasswordsGenerated = Stdin.readInt ();
            // number of passwords Generated
            for (int numOfPasswords = 0 ; numOfPasswords < numOfPasswordsGenerated ; numOfPasswords++)
            { //number of letter in each password
 
                for (int numOfLetters = 0 ; numOfLetters < numOfPassLetters ; numOfLetters++)
                {
                    System.out.print (passLetters.substring (letterSelecter, letterSelecter + 1));
                } //numbr of numbers placed in each password
                for (int numOfNumbers = 0 ; numOfNumbers < numOfPassNumbers ; numOfNumbers++)
                {
                    int numberSelector = myRandom.nextInt (9);
                    System.out.print (numberSelector);
                }
                System.out.print ("\n\n");
            }
            System.out.print ("Would you like to generate more passwords? type 1 to generate more\nEnter 2 to stop: ");
            int determineEnd = Stdin.readInt ();
            if (determineEnd == 2)
            {
                System.out.println ("\nProgram will now Terminate");
                end = true;
            }
        }
        while (end == false);
 
 
    } // main method
} // PasswordGenerator class

there is what im at this point im thinking of allowing the option of mixing letters and numbers but havent got there yet i need to get past this stage before i make any more changes