GradeAnalyzer.java:17: error: bad operand types for binary operator '+'
        sum += grades;
            ^
  first type:  int
  second type: ArrayList<Integer>
GradeAnalyzer.java:38: error: cannot find symbol
    gradeAnalyzer myAnalyzer = new gradeAnalyzer();
    ^
  symbol:   class gradeAnalyzer
  location: class GradeAnalyzer
GradeAnalyzer.java:38: error: cannot find symbol
    gradeAnalyzer myAnalyzer = new gradeAnalyzer();
                                   ^
  symbol:   class gradeAnalyzer
  location: class GradeAnalyzer
3 errors