Password

import java.util.*; public class Password{ public static void main(String arg[]){ String[] al = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","0","1","2","3","4","5","6","7","8","9"}; ArrayList<String> AL = new ArrayList<String>(Arrays.asList(al)); int counter = 0; ArrayList<String> password = new ArrayList<String>(); while(counter < 8){ password.add("na"); counter++; } for(int i = 0;i < 26;i++){ AL.add(al[i].toUpperCase()); } boolean lower = false; boolean upper = false; boolean number = false; while(lower == false && upper == false && number == false){ for(int i = 0; i < 8; i++){ int random = (int)(Math.random() * 62); password.set(i,AL.get(random)); if(random >= 0 && random < 26) lower = true; if(random >= 26 && random < 36) number = true; if(random >= 36){ upper = true; password.add(al[i].toUpperCase()); } } } ArrayList<String> pass = new ArrayList<String>(); System.out.println(password); } }