Android generates random numbers

public void Getcharandnumr () {//String val = "", va= "";                 String a= "", b= "", c= "", d= "";     Random random = new random (); for (int i = 0; i < 1; i++)//{//String Charornum = random.nextint (2)% 2 = = 0? "Char": "num";        Output letter or number/if ("char"). Equalsignorecase (Charornum))//string//if (true) {int choice = random.nextint (2)% 2 = = 0? 65:97;//Get capital letters or lowercase letters//a + = (char) (CH             Oice + Random.nextint (26));               B + = (char) (Choice + random.nextint (26)); Choice = random.nextint (2)% 2 = = 0? 65:97;        Gets the uppercase or lowercase letter A + = (char) (Choice + random.nextint (26)); }//else if ("num". Equalsignorecase (Charornum))//number//if (true)//{////va  L + = string.valueof (Random.nextint (10)); int choice = random.nextint (2)% 2 = = 0? 65:97; Get uppercase or lowercase letters/a + = (chAR) (choice + random.nextint (26));   B + = (char) (Choice + random.nextint (26));   } TextView tw1= (TextView) Findviewbyid (R.ID.TEXTVIEW3);  String a= "", b= ""; c = string.valueof ((int) (Math.random () * 9+1)); D = string.valueof ((int) (Math.random () * 9+1)); Tw1.settext (A + "" +c+ "" +b+ "" +d+ ""); }//Contentvalues values = new Contentvalues ();     Values.put ("Name", Tw1.gettext (). toString ());//Db.insert ("tb_1", null, values);  }