我该如何修复我的if循环，以便它们实际上被执行？

Question

该程序接受用户输入，打印出总经，并计算学期和总学分的gpa。到目前为止，它们都正常工作（还有其他三个不可见的类）。除非我对if语句的底部条件始终无法正确初始化。因为if语句内部的方法用于将成绩添加到列表中，而这些列表用于计算GPA，所以这将引发整个程序。每个收到的潜在成绩都有相同的if陈述。

public class MainController {


    public static void main(String[] args) {

        String aLetterGrade;

        ConsoleView aView = new ConsoleView();
        ConsoleViewSemester aPrintGPA = new ConsoleViewSemester();
        ArrayList<Object> grades = new ArrayList<Object>();
        SemesterGrades aSemesterGrade = new SemesterGrades();


        Scanner school = new Scanner(System.in);
        Scanner classId = new Scanner(System.in);
        Scanner profName = new Scanner(System.in);
        Scanner credits = new Scanner(System.in);
        Scanner letterGrade = new Scanner(System.in);
        Scanner newGrades = new Scanner(System.in);
        Scanner end = new Scanner(System.in);
        Scanner yesNo = new Scanner(System.in);

        boolean initialize;
        initialize = false;

        System.out.print("Do you have grades to enter(enter 0 for no and 1 for yes): ");
        int no = yesNo.nextInt();

        if (no == 0) {
            initialize = true;
        }



        while (initialize != true ) { 

            //SemesterGrades aSemesterGrade = new SemesterGrades();
            GetTotals aTotals = new GetTotals();


            System.out.print("Enter the two letter ID for the school the course is in: ");
            String aSchool = school.next();

            System.out.print("Enter the course ID: ");
            int aClassId = classId.nextInt();

            System.out.print("Enter the professor's name: ");
            String aProfName = profName.next();

            System.out.print("Enter the amount of credits taken: ");
            int aCredits = credits.nextInt();

            System.out.print("Enter the letter grade recieved if the course is completed, otherwise enter null: "); 
            aLetterGrade = letterGrade.next();


            System.out.print("Is that all of your semesters grades(enter -1 to stop, any other number to continue)?: ");
            int aEnd = end.nextInt();




            if ((aLetterGrade == "a") || (aLetterGrade == "A") || (aLetterGrade == "a+") || (aLetterGrade == "A+")) {
                double aGPRecieved = 4.0;
                aSemesterGrade.getGPs(aGPRecieved);
                aTotals.getGPs(aGPRecieved);

            }

            if ((aLetterGrade == "a-") || (aLetterGrade == "A-")) {
                double aGPRecieved = 3.7;
                //gradePoints.add(aGPRecieved);
                aSemesterGrade.getGPs(aGPRecieved);
                aTotals.getGPs(aGPRecieved);
            }