Problem 1. Modifying Class GradeBook (Fig. 5.1). Include a second String instanc

Question

Problem 1. Modifying Class GradeBook (Fig. 5.1). Include a second String instance variable that represents the name of the course's instructor. Provide a set method to change the instructor's name and a get method to retrieve it. Modify the constructor to specify two parameters-one for the course name and one for the instructor's name. Modify method displayMessage such that it first outputs the welcome message and course name, then outputs This course is presented by: " followed by the instructor's name. Modify the test application (Fig. 5.2) to demonstrate the class's new capabilities Sample Output

Explanation / Answer

Given below is the code for the question.
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GradeBook.java
================
public class GradeBook{
private String courseName;
private String instructorName;

public GradeBook(String name, String instructor){
courseName = name;
instructorName = instructor;
}

public void setCourseName(String name){
courseName = name;
}

public String getCourseName(){
return courseName;
}

public void setInstructorName(String name){
instructorName = name;
}

public String getInstructorName(){
return instructorName;
}

public void displayMessage(){
System.out.printf("Welcome to the grade book for %s! ", getCourseName());
System.out.printf("This course is presented by: %s ", getInstructorName());
}
}

GradeBookTest.java
================

public class GradeBookTest {
public static void main(String[] args) {
GradeBook gradeBook1 = new GradeBook("CS101 Introduction to Java Programming", "Sam Smith");

gradeBook1.displayMessage();

System.out.printf(" Changing instructor name to Judy Jones ");
gradeBook1.setInstructorName("Judy Jones");
gradeBook1.displayMessage();
}
}

------output-----
Welcome to the grade book for
CS101 Introduction to Java Programming!
This course is presented by: Sam Smith

Changing instructor name to Judy Jones

Welcome to the grade book for
CS101 Introduction to Java Programming!
This course is presented by: Judy Jones

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