get a fixed-length random string , its a mixture of lowercase letters concode_field_sep String NUMBERS_AND_LETTERS concode_elem_sep String LETTERS concode_elem_sep String CAPITAL_LETTERS concode_elem_sep String LOWER_CASE_LETTERS concode_elem_sep String NUMBERS concode_field_sep String getRandomLetters concode_elem_sep String getRandom concode_elem_sep String getRandom concode_elem_sep int getRandom concode_elem_sep int getRandom concode_elem_sep String getRandomNumbers concode_elem_sep String getRandomCapitalLetters concode_elem_sep boolean shuffle concode_elem_sep boolean shuffle concode_elem_sep int[] shuffle concode_elem_sep int[] shuffle concode_elem_sep String getRandomNumbersAndLetters
String function ( int arg0 ) { return getRandom ( LOWER_CASE_LETTERS , arg0 ) ; }