Class that contains a String instance variable and methods to set and get its value : Defining Class « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Defining Class

public class MainClass
{
   public static void main( String args[] )
   { 
      GradeBook myGradeBook = new GradeBook(); 

      System.out.printf( "Initial course name is: %s\n\n",myGradeBook.getCourseName() );

      String theName = "Java";
      myGradeBook.setCourseName( theName ); // set the course name

      myGradeBook.displayMessage();
   }
} 

class GradeBook
{
   private String courseName; // course name for this GradeBook

   // method to set the course name
   public void setCourseName( String name )
   {
      courseName = name; // store the course name
   }

   // method to retrieve the course name
   public String getCourseName()
   {
      return courseName;
   }

   // display a welcome message to the GradeBook user
   public void displayMessage()
   {
      System.out.printf( "Welcome to the grade book for\n%s!\n", 
         getCourseName() );
   }

}

Initial course name is: null

Welcome to the grade book for
Java!