1.Exercise 7: Modify your printDetails method to include printing thereference number. However, the method should print the reference numberonly if it has been set-that is, if the refNumber string has a non-zerolength. If it has not been set, then print the string "ZZz" instead. Hint:Use a conditional statement whose test calls the length method on therefNumber string.Exercise 8: Modify your setRefNumber mutator so that it sets the refNumberfield only if the parameter is a string of at least three characters. Ifit is less than three, then print an error message and leave the fieldunchanged.Exercise 9: Add a further integer field, borrowed, to the Book class. Thiskeeps a count of the number of times a book has been borrowed. Add a mutator,borrow, to the class. This should update the field by 1 each time it iscalled. Include an accessor, getBorrowed, that returns the value of thisnew field as its result. Modify printDetails so that it includes the valueof this field with an explanatory piece of text.Exercise 10: Add a further boolean field, courseText, to the Book class.This records whether or not a book is being used as a text book on a course.The field should be set through a parameter to the constructor, and thefield is immutable. Provide an accessor method for it called isCourseText. Exercise 1: Add two accessor methods to the class-getAuthor andgetTitle- that return the author and title fields as their respectiveresults. Test your class by creating some instances and calling themethods.Exercise 2: Add two methods, printAuthor and printTitle, to the outlineBook class. These should print the author and title fields, respectively,to the terminal window.Exercise 3: Add a field, pages, to the Book class to store the numberof pages. This should be of type int, and its initial value should be passedto the single constructor, along with the author and title strings.Include an appropriate getPages accessor method for this field.Exercise 4: Are the Book objects you have implemented immutable? Justifyyour answer.Exercise 5: Add a method, printDetails, to the Book class. This shouldprint details of the author, title, and pages to the terminal window. Itis your choice how the details are formatted. For instance, all three itemscould be printed on a single line, or each could be printed on a separateline. You might also choose to include some explanatory text to help auser work out which is the author and which is the title, for example Title:Robinson Crusoe, Author: Daniel Defoe, Pages: 232Exercise 6: Add a further field, refNumber, to the Book class. This fieldcan store a reference number for a library, for example. It should be oftype String and initialized to the zero length string ("") in theconstructor, as its initial value is not passed in a parameter to theconstructor. Instead, define a mutator for it with the following header:public void setRefNumber (String ref) The body of this method should assign

Question

1.Exercise 7: Modify your printDetails method to include printing thereference number. However, the method should print the reference numberonly if it has been set-that is, if the refNumber string has a non-zerolength. If it has not been set, then print the string &#34;ZZz&#34; instead. Hint:Use a conditional statement whose test calls the length method on therefNumber string.Exercise 8: Modify your setRefNumber mutator so that it sets the refNumberfield only if the parameter is a string of at least three characters. Ifit is less than three, then print an error message and leave the fieldunchanged.Exercise 9: Add a further integer field, borrowed, to the Book class. Thiskeeps a count of the number of times a book has been borrowed. Add a mutator,borrow, to the class. This should update the field by 1 each time it iscalled. Include an accessor, getBorrowed, that returns the value of thisnew field as its result. Modify printDetails so that it includes the valueof this field with an explanatory piece of text.Exercise 10: Add a further boolean field, courseText, to the Book class.This records whether or not a book is being used as a text book on a course.The field should be set through a parameter to the constructor, and thefield is immutable. Provide an accessor method for it called isCourseText. Exercise 1: Add two accessor methods to the class-getAuthor andgetTitle- that return the author and title fields as their respectiveresults. Test your class by creating some instances and calling themethods.Exercise 2: Add two methods, printAuthor and printTitle, to the outlineBook class. These should print the author and title fields, respectively,to the terminal window.Exercise 3: Add a field, pages, to the Book class to store the numberof pages. This should be of type int, and its initial value should be passedto the single constructor, along with the author and title strings.Include an appropriate getPages accessor method for this field.Exercise 4: Are the Book objects you have implemented immutable? Justifyyour answer.Exercise 5: Add a method, printDetails, to the Book class. This shouldprint details of the author, title, and pages to the terminal window. Itis your choice how the details are formatted. For instance, all three itemscould be printed on a single line, or each could be printed on a separateline. You might also choose to include some explanatory text to help auser work out which is the author and which is the title, for example Title:Robinson Crusoe, Author: Daniel Defoe, Pages: 232Exercise 6: Add a further field, refNumber, to the Book class. This fieldcan store a reference number for a library, for example. It should be oftype String and initialized to the zero length string (&#34;&#34;) in theconstructor, as its initial value is not passed in a parameter to theconstructor. Instead, define a mutator for it with the following header:public void setRefNumber (String ref) The body of this method should assign

Accepted Answer

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