This document discusses different ways to declare methods with parameters and use instance variables, set methods, and get methods in Java classes. It includes examples of declaring a method that takes a String parameter to display a welcome message for a course. It also shows using a private instance variable to store the course name, along with set and get methods to set and retrieve the course name. Finally, it demonstrates using a constructor to initialize the course name when creating an object.

1. //Declaring a method with a Parameter
public class GradeBook
{
public void displayMessage(String Course)
{
System.out.print("Welcome to the grade book for" +Course);
System.out.printf("Welcome to the grade book for n%sn", Course);
}
}
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import java.util.*;
public class GradeBookTest
{
public static void main(String[] args)
{
Scanner input= new Scanner(System.in);
GradeBook myGradeBook = new GradeBook();
System.out.println("Please enter the course name: ");
String nameofcourse = input.nextLine();
System.out.println();
myGradeBook.displayMessage(nameofcourse);
}
}
Instance Variable, Set Method and Get Method

2. public class GradeBook1
{
private String coursename;
public void setCourseName(String name)
{
coursename = name;
}
public String getCourseName()
{
return coursename;
}
public void displayMessage()
{
System.out.print("Welcome to the grade book for : " +getCourseName());
}
}
import java.util.*;
public class GradeBookTest1
{
public static void main(String[] args)
{
Scanner input= new Scanner(System.in);
GradeBook1 myGradeBook = new GradeBook1();
System.out.println("Initial Course Name: " +myGradeBook.getCourseName());

3. System.out.println("Please enter the course name: ");
String nameofcourse = input.nextLine();
myGradeBook.setCourseName(nameofcourse);
System.out.println();
myGradeBook.displayMessage();
}
}
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public class GradeBook2
{
private String coursename;
//Constructor Initializes coursename with String argument
public GradeBook2(String name)
{
coursename = name;
}
public void setCourseName(String name)
{
coursename = name;//stores the value
}
public String getCourseName()
{
return coursename;//retrieves the value
}

4. public void displayMessage()
{
System.out.print("Welcome to the grade book for : " +getCourseName());
}
}
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import java.util.*;
public class GradeBookTest2
{
public static void main(String[] args)
{
GradeBook2 myGradeBook1 = new GradeBook2(" Java Programming Languages");
GradeBook2 myGradeBook2 = new GradeBook2(" Speech and Oral Communication");
System.out.println(myGradeBook1.getCourseName());
System.out.println(myGradeBook2.getCourseName());
}
}