Can anyone help me to do the underlined one in this question?pls..

Assessment 2: Individual Assignment 4 Weightage Submission Deadline TBA Word Limit 30% NA Assignment Topic and Requirements You are supposed to write Java program for the following questions. For every question do provide at least THREE (3) different test cases. Question 1 (10 Marks) Modify question 3 of Assignment 1 to accept a telephone number with any number of letters. The output should display a hyphen after the first 3 digits and subsequently a hyphen (-) after every four digits. Also, modifv the proaram to process as manv telephone numbers as the user wants