Question

Write a method that takes an ArrayList of Integer objects and returns an ArrayList of Character objects of the same size. The returned elements of the ArrayList are assigned letter grade corresponding to integer grade of the same index element of the ArrayList parameter (A if 90 or above, F if less than 60). Include code to test your method. [For other letter grades: 80 ?? 89 −> ?, 70 ?? 79 −> ?, 60 ?? 69 −> ?]

Answer 1

public static ArrayList<Character> getLetterGrades(ArrayList<Integer> list){
    ArrayList<Character> res = new ArrayList<Character>();
    int grade;
    char output;
    for(int i = 0;i<list.size();i++){
        grade = list.get(i);
        if(grade>=60 && grade<=69)
            output = 'D';
        else if(grade>=70 && grade<=79)
            output = 'C';
        else if(grade>=80 && grade<=89)
            output = 'B';
        else if(grade>=90)
            output = 'A';
        else
            output = 'F';
        res.add(output);
    }
    return res;
}