Self-Check Problems 2. What is an object? How is an object difference from a class? 8. What is the difference between an accessor and a mutator? What naming conventions are used with accessors and mutators? 15. (You must complete Self-Check Problem 7 before answering this question) Write a toString method for the Name class that returns a String such as "John Q. Public". 20. What is the meaning of the keyword this? Describe three ways that the keyword can be used