Hi,

I need help to finish this program.

Thank you

import java.io.FileNotFoundException; import javax.swing.JFrame;

/** * The Main class containing the main() and run() methods. */ public class Main { public static void main(String[] pArgs) { new Main().run(); }

/** * The Roster of students that is read from the input file "gradebook.dat". */ ???

/** * A reference to the View object. */ ???

/** * This is where execution starts. Instantiate a Main object and then call run(). */ ???

/** * exit() is called when the Exit button in the View is clicked. When we exit we have to write * the roster to the output file "gradebook.dat". Then we exit the program with a code of 0. * * We open the file and write the roster to it in a try-catch block, where we catch a * FileNotFoundException that will be thrown if for some reason, we cannot open "gradebook.dat" * for writing. * * PSEUDOCODE: * method exit() : void * try * instantiate a GradebookWriter object named gbWriter, opening "gradebook.dat" for * writing * call writeGradebook(getRoster()) on gbWriter * call System.exit(0) to terminate the application with an exit code of 0 * catch FileNotFoundException e * call messageBox() on getView() to display a message box containing the text "Could * not open gradebook.dat for writing. Exiting without saving." * call System.exit(-1) to terminate the application with an error code of -1 * end try-catch * end exit */ private void run(){ JFrame.setDefaultLookAndFeelDecorated(true); setView(new View(this)); try { GradebookReader gradeBook = new GradebookReader("gradebook.txt"); setRoster(gradeBook.readGradebook()); mRoster = getRoster();

} catch (FileNotFoundException pException) { getView().messageBox("Could not open gradebook.txt for reading. Exiting."); System.exit(-1); } }

/** * This method returns the number of exams in the class. */ ???

/** * This method returns the number of homework assignments in the class. */ ??? /** * Accessor method for mRoster. */ private Roster getRoster() { return mRoster; }

/** * Accessor method for mView. */ private View getView() { return mView; }

/** * run() is the main routine and is called from main(). * * PSEUDOCODE: * method run * call JFrame.setDefaultLookAndFeelDecorated(true or false depending on your preference) * -- Create the View passing 'this' as the argument so the View will be linked to the Main * -- class so they may communicate with each other. Then pass the newly created View object * -- to setView() to save the reference to the View in our instance variable mView. * call setView(new View(this)) to create the View and stored the returned object in mView * try * -- Note that when we try to open "gradebook.dat" for reading that GradebookReader() * -- may throw a FileNotFoundException which we catch here. * create a GradbookReader object named gbReader opening "gradebook.dat" for reading * -- Read the student roster from the input file. * call readGradebook() on gbReader, which returns the Roster * call setRoster() on the Roster returned from readGradebook() to save the roster in * our instance variable mRoster * catch * call messageBox() on getView() to display the error message "Could not open * gradebook.dat for reading. Exiting." * call System.exit(-1) to terminate the application with an exit code of -1 * end try-catch * end run */ private void run(){ JFrame.setDefaultLookAndFeelDecorated(true); setView(new View(this)); try { GradebookReader gradeBook = new GradebookReader("gradebook.txt"); setRoster(gradeBook.readGradebook()); mRoster = getRoster();

} catch (FileNotFoundException pException) { getView().messageBox("Could not open gradebook.txt for reading. Exiting."); System.exit(-1); } }

/** * search() is called when the Search button is clicked in the View. The input parameter is * the last name of the Student to search the roster for. Call getStudent(pLastName) on the * Roster object (call getRoster() to get the reference to the Roster) to get a reference to * the Student with that last name. If the student is not located, getStudent() returns null. * * @param pLastName The last name of the student who we will search the Roster for. * * PSEUDOCODE: * method search(pLastName : String) : Student * call getRoster().getStudent(pLastName) and return what getStudent() returns * end search */ public Student search(String pLastName) { return getRoster().getStudent(pLastName); }

/** * Mutator method for mRoster. */ private void setRoster(Roster pRoster) { mRoster = pRoster; }

/** * Mutator method for mView. */ private void setView(View pView) { mView = pView; } }