Random Password Generator

Question

Hi everyone, I made this Password Generator that does what I want, but I'd like to extend its functionality. Right now it creates a random password from an array of letters and numbers.
import java.io.*;
import javax.swing.*;
import java.util.*;
*Version 0.1:
*creates several random passwords using numbers,
*uppercase and lowercase letters
*Version 0.2:
*add a save feature
public class PasswordGeneratorV02
    public static void main(String[] args)
         * Define all variables and create all objects here
        // create the Number and Letter arrays
        Integer[] numberList = new Integer[10];
        String[] letterList = new String[12];
        //Variable to continue the while loop
        Boolean cont = true;
        //Scanner used to continue or not
        Scanner input = new Scanner(System.in);
        //Stores the user input
        String answer;
         * End variables
        //fill the letterList array
        //need to find a more efficient way to do this
        //and add all the letters of the alphabet
        letterList[0] = "a";
        letterList[1] = "F";
        letterList[2] = "c";
        letterList[3] = "R";
        letterList[4] = "y";
        letterList[5] = "O";
        letterList[6] = "p";
        letterList[7] = "W";
        letterList[8] = "q";
        letterList[9] = "n";
        letterList[10]= "E";
        letterList[11]= "w";
        // fill it with numbers 0-9
        for (int i=0; i < numberList.length; i++)
            numberList= i;
// make both arrays lists so we can shuffle them
List list = Arrays.asList(numberList);
List list2 = Arrays.asList(letterList);
//Start the output to user
System.out.println("Welcome to the random password generator!");
System.out.println("This program will create a random 20 character alphanumeric password.");
System.out.println();
//Shuffles the array contents then prints it out.
while(cont == true)
// shuffle the list
Collections.shuffle(Arrays.asList(numberList));
Collections.shuffle(Arrays.asList(letterList));
// print out the shuffled array contents
for (int i : numberList)
System.out.print(i + letterList[i]);
System.out.println();
System.out.println("Press Enter for a new password. Q to quit.");
answer = input.nextLine();
//check to see if user wants to quit
if(answer.equalsIgnoreCase("q"))
cont = false;
System.out.println("Goodbye...");
}I would like to change/add two things.
1st, I want to change the array of letters to include the full alphabet(lower and uppercase), with out having to type it in.
2nd, I would like to add a save feature where the user types in "S" at the prompt and it will allow them to save the password as a text file.
Thanks in advance.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

Ok well, I googled around and found something.
The output now displays letters, but it no longer shuffles them around. For example:
6A8B7C4D2E0F5G1H3I9J
Every letter is just the next letter in the alphabet. How would I shuffle an array of chars?
New code:
import java.io.*;
import javax.swing.*;
import java.util.*;
*Version 0.1:
*creates several random passwords using numbers,
*uppercase and lowercase letters
*Version 0.2:
*add a save feature
public class PasswordGeneratorV02
    public static void main(String[] args)
         * Define all variables and create all objects here
        // create the Number and Letter arrays
        Integer[] numberList = new Integer[10];
        char[] letterList = "ABCDEFGHIJKLMNOPQRSTUWVXYZabcdefghijklmnpqrstuvwxyz".toCharArray();
        //Variable to continue the while loop
        Boolean cont = true;
        //Scanner used to continue or not
        Scanner input = new Scanner(System.in);
        //Stores the user input
        String answer;
         * End variables
        // fill it with numbers 0-9
        for (int i=0; i < numberList.length; i++)
            numberList= i;
// make both arrays lists so we can shuffle them
List list = Arrays.asList(numberList);
List list2 = Arrays.asList(letterList);
//Start the output to user
System.out.println("Welcome to the random password generator!");
System.out.println("This program will create a random 20 character alphanumeric password.");
System.out.println();
//Shuffles the array contents then prints it out.
while(cont == true)
// shuffle the list
Collections.shuffle(Arrays.asList(numberList));
Collections.shuffle(Arrays.asList(letterList));
// print out the shuffled array contents
for (int i=0;i<numberList.length;i++)
System.out.print(numberList[i] + String.valueOf(letterList[i]));
System.out.println();
System.out.println("Press Enter for a new password. Q to quit.");
answer = input.nextLine();
//check to see if user wants to quit
if(answer.equalsIgnoreCase("q"))
cont = false;
System.out.println("Goodbye...");