Grade

package grade;

public class Grade{ // Start of class

   public static void main(String[] args){
   {

   private char [ ] letterGrade = {'A', 'B', 'C', 'D', 'F'};
   private int numberGrade;
   private char grade;


   public void setGrade(int percent) {
       if(percent <=100 && percent >=90) {
           numberGrade = percent;
           grade = (char)letterGrade[0];
       }
       if(percent <=89 && percent >=80) {
           numberGrade = percent;
           grade = (char)letterGrade[1];
       }
       if(percent <=79 && percent >=70) {
           numberGrade = percent;
           grade = (char)letterGrade[2];
       }
       if(percent <=69 && percent >=60) {
           numberGrade = percent;
           grade = (char)letterGrade[3];
       }
       if(percent <=59 && percent >=0) {
           numberGrade = percent;
           grade = (char)letterGrade[4];
       }
   }

   public char getLetterGrade() {
       return grade;
   }

   public int getNumberGrade() {
       return numberGrade;
   }

   public void raiseGrade() {
       numberGrade = numberGrade + 10;
       setGrade(numberGrade);
   }

   public void lowerGrade() {
       numberGrade = numberGrade - 15;
       setGrade(numberGrade);
   }

   public void displayAllGrades() {
       System.out.println("100 - 90 = " + letterGrade[0]);
       System.out.println("89 - 80 = " + letterGrade[1]);
       System.out.println("79 - 70 = " + letterGrade[2]);
       System.out.println("69 - 60 = " + letterGrade[3]);
       System.out.println("59 - 0 = " + letterGrade[4]);
   }

   public void students (char student) {
       switch(student) {
           case 'D':
               System.out.println("Baker College Grading Standard:\n");
               displayAllGrades();
               break;
           case 'B':
               setGrade(89);
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("\nBill started with " + numberGrade + " points and a grade of " + grade + " in his class.");
               raiseGrade();
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Bill passed his quiz. His points went up to " + numberGrade + " points and a grade of " + grade + " in his class.");
               lowerGrade();
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Bill did not do well on his project. His points dropped to " + numberGrade + " points and a final grade of " + grade + " in his class.");
               break;
           case 'S':
                setGrade(92);
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("\nSusan started with " + numberGrade + " points and a grade of " + grade + " in her class.");
               lowerGrade();
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Susan failed her quiz. Her points dropped to " + numberGrade + " points and a grade of " + grade + " in her class.");
               raiseGrade();
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Susan did well on her project. Her points have risen to " + numberGrade + " points and a final grade of " + grade + " in her class.\n");
               break;
       } // End of switch construct
   } // End of students method

} // End of class