CodeAlpha_StudentGradeTracker

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.util.ArrayList;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class StudentGradeTracker extends JFrame {
    private final JTextField nameField;
    private JTextField gradeField;
    private final JTextArea reportArea;
    private JButton addButton = null;
    private JButton showButton;

    private final ArrayList<String> names = new ArrayList<>();
    private final ArrayList<Double> grades = new ArrayList<>();

    public StudentGradeTracker() {
        setTitle("Student Grade Tracker");
        setSize(500, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        // Input Panel
        JPanel inputPanel = new JPanel(new GridLayout(3, 2, 10, 10));
        inputPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
        nameField = new JTextField();
        gradeField = new JTextField();

        inputPanel.add(new JLabel("Student Name:"));
        inputPanel.add(nameField);
        inputPanel.add(new JLabel("Grade (0–100):"));
        inputPanel.add(gradeField);

        method();
        showButton = new JButton("Show Report");

        inputPanel.add(addButton);
        inputPanel.add(showButton);

        add(inputPanel, BorderLayout.NORTH);

        // Report Area
        reportArea = new JTextArea();
        reportArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(reportArea);
        add(scrollPane, BorderLayout.CENTER);

        // Button Actions
        addButton.addActionListener(e -> addStudent());
        showButton.addActionListener(e -> showReport());
    }

    public StudentGradeTracker(JTextField nameField, JTextArea reportArea) throws HeadlessException {
        this.nameField = nameField;
        this.reportArea = reportArea;
    }

    private void addStudent() {
        String name = nameField.getText().trim();
        String gradeText = gradeField.getText().trim();

        if (name.isEmpty() || gradeText.isEmpty()) {
            JOptionPane.showMessageDialog(this, "Please enter both name and grade.");
            return;
        }

        try {
            double grade = Double.parseDouble(gradeText);
            if (grade < 0 || grade > 100) {
                throw new NumberFormatException();
            }
            names.add(name);
            grades.add(grade);
            reportArea.append("✔ " + name + " added with grade: " + grade + "\n");
            nameField.setText("");
            gradeField.setText("");
        } catch (NumberFormatException ex) {
            JOptionPane.showMessageDialog(this, "Grade must be a number between 0 and 100.");
        }
    }

    private void showReport() {
        if (grades.isEmpty()) {
            reportArea.setText("No students added yet.");
            return;
        }

        double total = 0, max = -1, min = 101;
        String topStudent = "", lowStudent = "";

        StringBuilder report = new StringBuilder("---- Student Summary ----\n");

        for (int i = 0; i < names.size(); i++) {
            double g = grades.get(i);
            report.append(names.get(i)).append(" : ").append(g).append("\n");
            total += g;
            if (g > max) {
                max = g;
                topStudent = names.get(i);
            }
            if (g < min) {
                min = g;
                lowStudent = names.get(i);
            }
        }

        double average = total / grades.size();
        report.append("\nAverage Grade: ").append(String.format("%.2f", average))
              .append("\nHighest Grade: ").append(String.format("%.2f", max)).append(" (").append(topStudent).append(")")
              .append("\nLowest Grade : ").append(String.format("%.2f", min)).append(" (").append(lowStudent).append(")");

        reportArea.setText(report.toString());
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new StudentGradeTracker().setVisible(true));
    }

    public JButton getAddButton() {
        return addButton;
    }

    private void method() {
        addButton = new JButton("Add Student");
    }
}