(Implement bidirectional iterator) The java.util.Iterator interface defines a forward iterator. The Java API also provides the java.util.ListIterator interface that defines a bidirectional iterator. Study ListIterator and define a bidirectional iterator for the BST class.
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- (Package Inheritance Hierarchy) Use the Package inheritance hierarchy created inExercise 19.9 to create a program that displays the address information and calculates the shippingcosts for several Packages. The program should contain a vector of Package pointers to objects ofclasses TwoDayPackage and OvernightPackage. Loop through the vector to process the Packagespolymorphically. For each Package, invoke get functions to obtain the address information of thesender and the recipient, then print the two addresses as they would appear on mailing labels. Also,call each Package’s calculateCost member function and print the result. Keep track of the totalshipping cost for all Packages in the vector, and display this total when the loop terminates.arrow_forward(10 points) Consider a new secondary method for the Statement component family. Complete the code of the WHILE and CALL cases in the implementation of the instance method aggression below. You may assume that the code for the other cases has already been written. /** * Switches all skip calls with infect calls. * * @ensures * public void aggression () { switch (this.kind ()) { // assume code for BLOCK, IF, and IF ELSE cases already implemented case WHILE: { } this = [#this with skip replaced by infect] } break; case CALL: { break; The del default: { // this will never happen break;arrow_forward(Java) Question 2 Explain the answer step-by-step and include verbal explanation. Thank you! What is the difference between overriding a method and overloading a method? Select the correct option next to each statement, or select both options if the statement is true for both. Both methods have the same name: Overriding / Overloading Both methods have the same signature: Overriding / Overloading Both methods are defined in the same class: Overriding / Overloadingarrow_forward
- (java programing) Define a student class. A student has the following attributes: Firstname: the name of the student lastname: the name of the family Gender: which can be male or female status: which can be equal to freshman, sophomore, junior, and senior gpa: The average which value is between 0.0 to 4.0 Then define the following methods for the student class. • The show_myself: method will simply print all the attribute variables when called upon the object. This method has no input arguments. • The study_time: method will increment the gpa of the student according to the following formula: ` gpa = gpa + log(study_time)`. The only input argument of this method is the variable study_time. • In addition make sure that the gpa variable never exceeds 4.0 even if the student studies for a very long time. • Any necessary methods that is required for such class.arrow_forward(Dynamic Binding vs. Static Binding) Distinguish between static binding and dynamicbinding. Explain the use of virtual functions and the vtable in dynamic bindingarrow_forward(In Java language) Create a class Called NetflixDemo Create two objects “user1” and “user2” of the Netflix class pictured below) Set various class variables for the Netflix class using these two objects. Call various methods of Netflix class using these two objects. public class Netflix {public String movies [] = new String[10];public String trendingTop5 [] = new String[5];public String continueWatching [] = new String[5];public String username;public String password;private boolean isAuthenticated;public double balance;public int subscriberSinceYear;public static void logininfo() {Scanner input = new Scanner(System.in);System.out.println("Enter the username");String username = input.nextLine();System.out.println("Enter the password");String password = input.nextLine();boolean isAuthenticated = true;System.out.println(isAuthenticated + " , You have successfully logged in ");System.out.println();}public static void trendingList(){Scanner input = new…arrow_forward
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