Added : added calculateAverageGrade() in Class Student

src/main/java/org/example/Student.java

@@ -128,4 +128,18 @@ public class Student {
         return totalCredits;
     }
 
+    public double calculateAverageGrade() {
+        double totalWeightedGrades = 0.0;
+        int totalCredits = calculateTotalCredits(); // Use the existing method to get the total credits
+
+        for (Map.Entry<Course, String> entry : courseGrades.entrySet()) {
+            Course course = entry.getKey();
+            double grade = Double.parseDouble(entry.getValue()); // Assuming grades are stored as String and can be parsed to double
+            int credits = course.getCourseCredits();
+
+            totalWeightedGrades += grade * credits;
+        }
+
+        return totalCredits > 0 ? totalWeightedGrades / totalCredits : 0.0;
+    }
 }