passwordGenerator.java

/**
 * various math equations
 *
 * @author (Erica)
 * @version (9/18/18)
 */
public class objectClass
{
    public objectClass(){
        
    }
    public int getRandom(int min, int max){
        return (int)(Math.random() * ((max-min) + 1)) + min;
    }
}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
import java.util.*;
public class runnerClass
{
    
    public static void main(String[] args)
    {
        Scanner scan = new Scanner(System.in);
        objectClass oc = new objectClass();
        //int rand = oc.getRandom(1,10);
        //System.out.println(rand);
        
        String letters = "abcdefghijklmnopqrstuvwxyz";
        String numbers = "0123456789";
        String spec = "!@#$%^&*?";
        
        int count = 0;
        int pick;
        int rand;
        String password = "Password: ";
        int lettersUsed = 0;
        int numbersUsed = 0;
        int specUsed = 0;
        int upperUsed = 0;
        
        System.out.println("How long do you want the minimum length of your password to be?");
        System.out.println("Make it at least 8 long.");
        int length = -1;
        while(length == -1){
            length = bigEnough(scan.nextInt());
        }
        
        
        while (count < length){
            pick = oc.getRandom(0,3);
            if(pick == 0){
                lettersUsed++;
                rand = oc.getRandom(1, letters.length()-1);
                password = password + letters.substring(rand-1, rand);
                
            }else if(pick == 1){
                numbersUsed ++;
                rand = oc.getRandom(1, numbers.length()-1);
                password = password + numbers.substring(rand-1, rand);
            }else if(pick == 2){
                specUsed ++;
                rand = oc.getRandom(1, spec.length()-1);
                password = password + spec.substring(rand-1, rand);
            }else{
                upperUsed ++;
                rand = oc.getRandom(1, letters.length()-1);
                password = password + (letters.substring(rand-1, rand)).toUpperCase();
            }
            count++;
        }
        if(lettersUsed == 0 ){
            rand = oc.getRandom(1, letters.length());
            password = password + letters.substring(rand-1, rand);
        }
        if(numbersUsed == 0 ){
            rand = oc.getRandom(1, numbers.length());
            password = password + numbers.substring(rand-1, rand);
        }
        if(specUsed == 0 ){
            rand = oc.getRandom(1, spec.length());
            password = password + spec.substring(rand-1, rand);
        }
        if(upperUsed == 0 ){
            rand = oc.getRandom(1, letters.length()-1);
            password = password + (letters.substring(rand-1, rand)).toUpperCase();
        }
        System.out.println(password);
    }
    public static int bigEnough(int x){
        if(x >= 8){
            return x;
        }else{
            System.out.println("That's not long enough");
            return -1;
            
        }
    }

    
}