Added Grade.java with grading method

Author: KaziRifatAlMuin

src/main/Grade.java

@@ -0,0 +1,63 @@
+public class Grade {
+    private String courseName;
+    private int marks;
+    private String grade;
+    private double gradePoint;
+
+    // Constructor
+    public Grade(String courseName, int marks) {
+        this.courseName = courseName;
+        this.marks = marks;
+        setGradeAndPoint(marks); // auto-assign grade and GPA
+    }
+
+    // Getters
+    public String getCourseName() {
+        return courseName;
+    }
+
+    public int getMarks() {
+        return marks;
+    }
+
+    public String getGrade() {
+        return grade;
+    }
+
+    public double getGradePoint() {
+        return gradePoint;
+    }
+
+    // Setters
+    public void setCourseName(String courseName) {
+        this.courseName = courseName;
+    }
+
+    public void setMarks(int marks) {
+        this.marks = marks;
+        setGradeAndPoint(marks); // update grade & GPA when marks change
+    }
+
+    // Private helper to assign grade & GPA based on KUET rules
+    private void setGradeAndPoint(int marks) {
+        if (marks >= 80) { grade = "A+"; gradePoint = 4.00; }
+        else if (marks >= 75) { grade = "A"; gradePoint = 3.75; }
+        else if (marks >= 70) { grade = "A-"; gradePoint = 3.50; }
+        else if (marks >= 65) { grade = "B+"; gradePoint = 3.25; }
+        else if (marks >= 60) { grade = "B"; gradePoint = 3.00; }
+        else if (marks >= 55) { grade = "B-"; gradePoint = 2.75; }
+        else if (marks >= 50) { grade = "C+"; gradePoint = 2.50; }
+        else if (marks >= 45) { grade = "C"; gradePoint = 2.25; }
+        else if (marks >= 40) { grade = "D"; gradePoint = 2.00; }
+        else { grade = "F"; gradePoint = 0.00; }
+    }
+
+    // Print method
+    public void printInfo() {
+        System.out.println("Course: " + courseName +
+                           " | Marks: " + marks +
+                           " | Grade: " + grade +
+                           " | GPA: " + gradePoint);
+    }
+}
+// End of Grade class