(telephone-number word generator) standard telephone keypads contain the digits zero through nine. the numbers two through nine each have three letters associated with them fig. 1 below. many people find it difficult to memorize phone numbers, so they use the correspondence between digits and letters to develop seven-letter words that correspond to their phone numbers. for example, a person whose telephone number is 686-2377 might use the correspondence indicated in fig. 1 to develop the seven-letter word "numbers." every seven-letter word corresponds to exactly one seven-digit telephone number. a restaurant wishing to increase its takeout business could surely do so with the number 825-3688 (i. e., "takeout").every seven-letter phone number corresponds to many different seven-letter words, but most of these words represent unrecognizable juxtapositions of letters. it’s possible, however, that the owner of a barbershop would be to know that the shop’s telephone number, 424-7288, corresponds to "haircut." a veterinarian with the phone number 738-2273 would be to know that the number corresponds to the letters "petcare." an automotive dealership would be to know that the dealership number, 639-2277, corresponds to "newcars."2a b c5j k l8t u v3d e f6m n o9w x y4g h i7p r sfig. 1 telephone keypad digits and letters. write a program that, given a seven-digit number, uses a formatter object to write to a file every possible seven-letter word combination corresponding to that number. there are 2,187 (37)(37) such combinations. avoid phone numbers with the digits 0 and 1.use the phonetest. java to test your program.// exercise 15.7 solution: phonetest. java// testing the phone class. import java. util. scanner; import java. util. nosuchelementexception; public class phonetest {public static void main(string[] args) {scanner scanner = new scanner(system. in); phone application = new phone(); system. out. print("enter phone number (digits greater than 1 only): "); try {application. calculate(scanner.; }catch (nosuchelementexception elementexception) {system. err. println("error inputting data."); }}}