the compiler is saying "}" is expected on line 105 but when i add this closed bracket the problem is not solved as it says the same thing again when i compile it.
these errors occur in both of these programs.

package arrayclasses;

import java.util.*;

public class ArrayListClassList {
   private String courseTitle;
   private String discipline;
   private String semester;
   private String instructor;
   private String courseID;
   private ArrayList studentList;

   public ArrayListClassList(String title, String disc,
                             String sem, String ins, String ID, String s) {
      courseTitle = title;
      discipline = disc;
      semester = sem;
      instructor = ins;
      courseID = ID;
      studentList = new ArrayList();
      student = s;
   }

   public void add(Student s) { // don't forget duplicates
      studentList.add(s);
   }

   public String getCourseID() {
      return courseID;
   }

   public String getDiscipline() {
      return discipline;
   }

   public double getGrade(String ID) {
      Student thisStudent = getStudent(ID);
      if (thisStudent == null){
         return -1;
      return thisStudent.getGrade();
   }
}
   public String getInstructor() {
      return instructor;
   }

   public String getSemester() {
      return semester;
   }

   public String getStudent() {
       return student;
   }

   public Student getStudent(String ID) {
      int position = find(ID);
      if (position == -1){
         return null;
      return (Student) (studentList.get(position));

   }
}

   public String getTitle() {
      return courseTitle;
   }

   public void remove(String ID) {
      int position = find(ID);
      if (position == -1){
         return;
      studentList.remove(position);
   }
}

   public void setGrade(String ID, double grade) {
      Student thisStudent = getStudent(ID);
      if (thisStudent != null){
         thisStudent.setGrade(grade);
   }
}

   public String toString() {
      StringBuffer buf = new StringBuffer(getClass().getName() + "[title=" +
                                          courseTitle + ",discipline=" +
                                          discipline +
                                          ",semester=" + semester +
                                          ",courseID=" +
                                          courseID + ",instructor=" +
                                          instructor + "]");
      for (int i = 0; i < studentList.size(); i++){
         buf.append("\n" + studentList.get(i));
      return buf.toString();
   }
}

   private int find(String ID) {
      for (int i = 0; i < studentList.size(); i++){
         if (ID.equals(( (Student) studentList.get(i)).getID())){
            return i;
      return -1;

   }
}
}


package arrayclasses;

public class ArrayListClassListTester {
   public static void main(String[] args) {
      ArrayListClassList cs1713 = new ArrayListClassList("Intro to Programming",
            "CS", "Fall2004", "Kay Robbins", "CS102333");
      System.out.println("\nClass is " + cs1713);
      cs1713.add(new Student("John", "348234", 95));
      System.out.println("\nAfter 1 add :" + cs1713);
      cs1713.add(new Student("John", "348235", 95));
      System.out.println("\nAfter 2 add :" + cs1713);
      cs1713.add(new Student("Fred", "12345", 80));
      System.out.println("\nAfter 3 add :" + cs1713);
      cs1713.remove("348234");
      System.out.println("\nRemoving 1 : " + cs1713);
      cs1713.setGrade("12345", 90);
      System.out.println("\nAfter changing Fred's :" + cs1713);
   }
}