NBKRIST Java Hub

Problem Statement: Student Results System

Your task is to create a simple Java program to manage student results. This problem is designed to help you practice creating a well-structured class with its own data and behavior, applying the fundamental concept of **encapsulation**.

Functional Requirements

• Student Data: The system must store a student's ID, name, and their scores for three subjects: Math, Science, and English.
• Calculations: The program should be able to calculate the student's total score and average score.
• Grading: Based on the average score, the program should assign a letter grade according to the following scale:
  • Average >= 90: 'A'
  • Average >= 80: 'B'
  • Average >= 70: 'C'
  • Average >= 60: 'D'
  • Average < 60: 'F'
• Report: The system must display a full report for a student, including all their information, scores, and final grade.

Technical Requirements

• Create a Student Class: Design a single class named Student to represent a student's data and actions.
• Use Encapsulation:
  • All fields (e.g., `studentId`, `name`, `mathScore`) must be declared as **private**.
  • You will use a constructor to initialize the fields and public methods to perform calculations and display the report.
• Methods:
  • A constructor to initialize the student's ID, name, and three scores.
  • public int getTotalScore(): A method to calculate and return the sum of all three scores.
  • public double getAverageScore(): A method to calculate and return the average score.
  • public char getGrade(): A method to determine and return the letter grade based on the average score.
  • public void displayReport(): A method that prints all student information and the final grade in a clear format.
• Demonstrate in `Main`: In your `main` method, create a few `Student` objects with different scores to test all the grading scenarios. Call the `displayReport()` method for each object.

Testing Requirements

Your main method must demonstrate the program works by testing the following scenarios:

1. Passing Student (Grade A): Create a `Student` object with scores like 95, 90, and 92. The output should show the correct average and an 'A' grade.
2. Average Student (Grade C): Create a `Student` object with scores like 70, 75, and 72. The output should show the correct average and a 'C' grade.
3. Failing Student (Grade F): Create a `Student` object with scores like 55, 45, and 50. The output should show the correct average and an 'F' grade.