Password Validator and Generator

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import java.util.regex.*; import java.util.*; import java.lang.*; import java.text.*; import java.math.*; public class PasswordValidator { public static boolean validate(String password) { if (password.matches("((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{8,20})")) return true; return false; } public static boolean symbol(String password) { if (password.matches(".*[@#$%].*")) return true; return false; } public static boolean uppcase(String password) { if (password.matches(".*[A-Z].*")) return true; return false; } public static boolean lowerCase(String password) { if (password.matches(".*[a-z].*")) return true; return false; } public static boolean digit(String password) { if (password.matches(".*\\d.*")) return true; return false; } public static boolean validate2(String pass) { boolean flag = true; if (pass.length() < 8) { System.out.println("Password must more than 8"); flag = false; } else if (!digit(pass)) { System.out.println("Password must contains digit"); flag = false; } else if (!symbol(pass)) { System.out.println("Password must contains symbol"); flag = false; } else if (!uppcase(pass)) { System.out.println("Password must contains Upper case"); flag = false; } else if (!lowerCase(pass)) { System.out.println("Password must contains Lower case"); flag = false; } return flag; } public static String randomString(int len) { Random rnd = new Random(); String AB = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz@#$%&"; StringBuilder sb = new StringBuilder(len); for (int i = 0; i < len; i++) sb.append(AB.charAt(rnd.nextInt(AB.length()))); return sb.toString(); } public static void main(String[] args) { Scanner scan = new Scanner(System.in); System.out.print("1. Generatae password 2. Test Password :"); int option = scan.nextInt(); switch (option) { case 1: String pass = ""; System.out.print("Length of password >8 : "); int len = scan.nextInt(); int count = 0; while (true) { if (len < 8) break; pass = randomString(len); if (validate(pass)) { break; } else { System.out.println("Retrying.."); count++; } } System.out.print("Password generated = " + pass); break; case 2: System.out.print("Password : "); String password = scan.next(); if (validate2(password)) { System.out.println("Pass"); } break; default: break; } } }