223006749 & 223021381

FirstGroupAssignment

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+/*
+
+Q1
+
+
+/* Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package firstquestion.loan;
+
+/**
+ *
+ * @author Bryan
+ */
+public class Loan {   
+    double monthlyPayment;
+    int numYearsforpayment;
+    double totalAmountforpayment;
+    public Loan(double monthlyPayment, int numYearsforpayment, double totalAmount) {
+        this.monthlyPayment = monthlyPayment;  
+        this.numYearsforpayment = numYearsforpayment;
+        this.totalAmountforpayment = totalAmountforpayment;
+    }
+    public void settingLoanDetails(double monthlyPayment, int numYearsforpayment, double totalAmount) {
+        this.monthlyPayment = monthlyPayment;
+        this.numYearsforpayment = numYearsforpayment;
+        this.totalAmountforpayment = totalAmountforpayment;
+    }
+    public void calculateTotalAmount() {
+        this.totalAmountforpayment = this.monthlyPayment * this.numYearsforpayment * 12; 
+    }
+    public double getMonthlyPayment() {
+        return monthlyPayment;
+    }
+
+    public int getNumYears() {
+        return numYearsforpayment;
+    }
+
+    public double getTotalAmount() {
+        return totalAmountforpayment;
+    }
+
+    public static void main(String[] args) {
+        Loan myLoan = new Loan(5000, 5, 0);  
+        myLoan.calculateTotalAmount();
+        System.out.println("Total amount to be payable in five years: RWF " + myLoan.getTotalAmount());
+    }
+}
+
+
+
+/*
+
+Q2
+
+
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package firstquestion.studentgui;
+
+/**
+ *
+ * @author Bryan
+ */
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.sql.*;
+
+public class StudentGUI extends JFrame {
+     JTextField REGnoField, nameField, ageField, emailField, departmentField;
+     JButton addButton, searchButton;
+
+
+    private final String DB_URL = "jdbc:mysql://localhost:3306/student_db";
+    private final String USER = "root";
+    private final String PASS = "";  
+
+    public StudentGUI() {
+
+        setTitle("Student Database");
+        setSize(400, 300);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLayout(new GridLayout(6, 2));
+
+
+        REGnoField = new JTextField();
+        nameField = new JTextField();
+        ageField = new JTextField();
+        emailField = new JTextField();
+        departmentField = new JTextField();
+        addButton = new JButton("Add Student");
+        searchButton = new JButton("Search by REGno");
+
+
+        add(new JLabel("REGno:"));
+        add(REGnoField);
+        add(new JLabel("Names:"));
+        add(nameField);
+
+        add(new JLabel("Age:"));
+        add(ageField);
+        add(new JLabel("Email:"));
+        add(emailField);
+        add(new JLabel("Department:"));
+        add(departmentField);
+        add(addButton);
+        add(searchButton);
+
+
+        addButton.addActionListener(new AddButtonListener());
+        searchButton.addActionListener(new SearchButtonListener());
+    }
+
+
+    private class AddButtonListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            int REGno = Integer.parseInt(REGnoField.getText());
+            String names = nameField.getText(); 
+            int age = Integer.parseInt(ageField.getText());
+            String email = emailField.getText();
+            String department = departmentField.getText();
+
+            try (Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
+                 PreparedStatement stmt = conn.prepareStatement("INSERT INTO students (REGno, Names, Age, Email, Department) VALUES (?, ?, ?, ?,?)")) {
+                stmt.setInt(1, REGno);
+                stmt.setString(2, names);
+                stmt.setInt(3, age);
+                stmt.setString(4, email);
+                stmt.setString(4, department);
+                stmt.executeUpdate();
+                JOptionPane.showMessageDialog(null, "Student added successfully!");
+            } catch (SQLException ex) {
+                ex.printStackTrace();
+                JOptionPane.showMessageDialog(null, "Error adding student to database.");
+            }
+        }
+    }
+
+
+    private class SearchButtonListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            int REGno= Integer.parseInt(REGnoField.getText());
+
+            try (Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
+                 PreparedStatement stmt = conn.prepareStatement("SELECT * FROM students WHERE id = ?")) {
+                stmt.setInt(1, REGno);
+                ResultSet rs = stmt.executeQuery();
+
+                if (rs.next()) {
+                    nameField.setText(rs.getString("name"));
+                    ageField.setText(String.valueOf(rs.getInt("age")));
+                    emailField.setText(rs.getString("email"));
+                    departmentField.setText(rs.getString("department"));
+                } else {
+                    JOptionPane.showMessageDialog(null, "Student not found.");
+                }
+            } catch (SQLException ex) {
+                ex.printStackTrace();
+                JOptionPane.showMessageDialog(null, "Error retrieving student data.");
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            StudentGUI gui = new StudentGUI();
+            gui.setVisible(true);
+        });
+    }
+}
+
+
+
+