java

Task\#1 Given a people Hashmad with the followine: a) Create a city class. b) Write a method that take this Hashmap and print the key and value separated by dash for all elements. c) Write a method that take this Hashmap and new key and value, this method should add this entry to Hashmap but without any duplication in the key. class Book: - constructor receives the author, isbn, title of the book and initializes the fields to these values, for author field, if it less than 4 character concatenate "***" with received data - constructor receives the name of the library and instantiates the objects books and registration of type HashSet and HashMap resp., number is set to 100