Sally and Harry implement two different compareTo methods for a class they are working on together. Sally’s compareTo method returns −1, 0, or +1, depending on the relationship between two objects. Harry’s compareTo method returns −6, 0, or +3. Which method is suitable?

Given a Student class, and UndergradCourse is a true subtype of Course, there is one method called recommend in the Student class:  public class Student {     public Course recommend(Course pCourseID); } Please evaluate if EACH of the method in UndergradStudent class violates the Liskov Substitution Principle. public class UndergradStudent extends Student { 1. public Course recommend(UndergradCourse pCourseID); 2. public UndergradCourse recommend(Course pCourseID); 3. public UndergradCourse recommend(Object pCourseID); 4. public Course recommend(Course pCourseID) throw SomeCheckedException;

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Lab 6 - Exercise 2. Write a test driver that reads data about two surgeons and print the specialization of the doctor with the highest salary using the method that compares the salary of surgeons. A Doctor class has the following private data members, constructor, and public methods: name (String) salary (int) End of document I A constructor without parameters, A constructor with parameters, A set method for the data variables (one method) A get method for each data members. A method to print Doctor information A Surgeon is a subclass of Doctor with the following private data members, constructor, and public methods: specialization (String) degree (string) A constructor without parameters, A constructor with parameters, · A set method for the data variables (one method) · A get method for each data member. · A method to print all Surgeon information. · A method that compares the salary of two Surgeons and return the specialization of the doctor with the higher salary. 1. Implement the…