for GradeBookWriter NEED help and explaination on last part?

/**
* GradebookWriter inherits from PrintWriter and writes the gradebook info to
* the file name passed to the ctor.
*/
public class GradebookWriter extends PrintWriter {

    /**
     * GradebookWriter() Call the super class ctor that takes a String.
     */
    public GradebookWriter(String pFname) throws FileNotFoundException {
        super(pFname);
    }

    /**
     * writeGradebook() Writes the gradebook info to the file, which was opened
     * in the ctor.
     *
     * PSEUDOCODE: EnhancedFor each student in pRoster.getStudentList() Do Call
     * println(student) End For Call close()
     */
    public void writeGradebook(Roster pRoster)
    {     //NEED CODE ???????
       
    }
                 
}