Instructor.java

package attendance.attendancesystem;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.*;
import javax.swing.table.DefaultTableModel;
import java.io.*;
import java.util.*;

public class Instructor extends javax.swing.JFrame {

    private static final String filePath = "C:\\Users\\User\\Documents\\NetBeansProjects\\AttendanceSystem\\src\\main\\java\\attendance\\attendancesystem\\student data.txt";
    public Instructor() {
        initComponents();
        setResizable(false);
        jTable1.getColumnModel().getColumn(2).setCellRenderer(new StatusCellRenderer());
        loadStudentIDs();
        loadStudentName();


    }
    class StatusCellRenderer extends DefaultTableCellRenderer {
    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
        
        // Change color based on the value of the status
        if (value != null) {
            String status = value.toString();
            if (status.equals("Present")) {
                cell.setForeground(new Color(48, 199, 80)); 
            } else if (status.equals("Late")) {
                cell.setForeground(new Color(233, 149, 14));
            } else if(status.equals("Absent")){
                cell.setForeground(Color.RED);
            }
            else {
                cell.setForeground(Color.BLACK); 
            }
        }
        
        return cell;
    }
}
    public void addTable(String id, String name, String status){
        DefaultTableModel dt = (DefaultTableModel) jTable1.getModel();
        Object[] rowData = {id, name, status};
        dt.addRow(rowData);
        
    }
 
    public void loadStudentIDs() {
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = br.readLine()) != null) {
                String[] data = line.split(",");
                if (data.length == 2) {
                    String studentId = data[0].trim();
                    jTextField1.setText(studentId);  
                    break; 
                }
            }
        } catch (IOException e) {
            JOptionPane.showMessageDialog(this, "Error reading file: " + e.getMessage(),
                    "File Error", JOptionPane.ERROR_MESSAGE);
        }
    }
    public void loadStudentName() {
        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = br.readLine()) != null) {
                String[] data = line.split(",");
                if (data.length == 2) {
                    String studentName = data[1].trim();
                    jTextField2.setText(studentName); 
                    break; 
                }
            }
        } catch (IOException e) {
            JOptionPane.showMessageDialog(this, "Error reading file: " + e.getMessage(),
                    "File Error", JOptionPane.ERROR_MESSAGE);
        }
    }
 
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jTextField2 = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        jComboBox1 = new javax.swing.JComboBox<>();
        jButton2 = new javax.swing.JButton();
        jButton1 = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setBackground(new java.awt.Color(255, 255, 255));

        jPanel1.setBackground(new java.awt.Color(34, 46, 80));

        jLabel1.setFont(new java.awt.Font("sansserif", 1, 18)); // NOI18N
        jLabel1.setForeground(new java.awt.Color(255, 255, 255));
        jLabel1.setText("Status");

        jTextField2.setBackground(new java.awt.Color(255, 255, 255));
        jTextField2.setFont(new java.awt.Font("sansserif", 0, 14)); // NOI18N
        jTextField2.setForeground(new java.awt.Color(0, 0, 0));
        jTextField2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField2ActionPerformed(evt);
            }
        });

        jLabel2.setFont(new java.awt.Font("sansserif", 1, 18)); // NOI18N
        jLabel2.setForeground(new java.awt.Color(255, 255, 255));
        jLabel2.setText("Student ID");

        jTextField1.setBackground(new java.awt.Color(255, 255, 255));
        jTextField1.setFont(new java.awt.Font("sansserif", 0, 14)); // NOI18N
        jTextField1.setForeground(new java.awt.Color(0, 0, 0));
        jTextField1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField1ActionPerformed(evt);
            }
        });

        jLabel3.setFont(new java.awt.Font("sansserif", 1, 18)); // NOI18N
        jLabel3.setForeground(new java.awt.Color(255, 255, 255));
        jLabel3.setText("Student Name");

        jComboBox1.setBackground(new java.awt.Color(255, 255, 255));
        jComboBox1.setFont(new java.awt.Font("sansserif", 0, 18)); // NOI18N
        jComboBox1.setForeground(new java.awt.Color(0, 0, 0));
        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Present", "Late", "Absent" }));
        jComboBox1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jComboBox1ActionPerformed(evt);
            }
        });

        jButton2.setBackground(new java.awt.Color(252, 203, 6));
        jButton2.setFont(new java.awt.Font("sansserif", 0, 18)); // NOI18N
        jButton2.setForeground(new java.awt.Color(0, 0, 0));
        jButton2.setText("Add");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton1.setBackground(new java.awt.Color(252, 203, 6));
        jButton1.setFont(new java.awt.Font("sansserif", 0, 18)); // NOI18N
        jButton1.setForeground(new java.awt.Color(0, 0, 0));
        jButton1.setText("Save");

        jPanel2.setBackground(new java.awt.Color(252, 203, 6));

        jTable1.setBackground(new java.awt.Color(237, 247, 246));
        jTable1.setFont(new java.awt.Font("Segoe UI", 0, 18)); // NOI18N
        jTable1.setForeground(new java.awt.Color(0, 0, 0));
        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "Student ID", "Student Name", "Status"
            }
        ) {
            boolean[] canEdit = new boolean [] {
                false, false, false
            };

            public boolean isCellEditable(int rowIndex, int columnIndex) {
                return canEdit [columnIndex];
            }
        });
        jTable1.setGridColor(new java.awt.Color(237, 247, 246));
        jScrollPane1.setViewportView(jTable1);
        if (jTable1.getColumnModel().getColumnCount() > 0) {
            jTable1.getColumnModel().getColumn(0).setResizable(false);
            jTable1.getColumnModel().getColumn(0).setPreferredWidth(10);
            jTable1.getColumnModel().getColumn(1).setResizable(false);
            jTable1.getColumnModel().getColumn(1).setPreferredWidth(50);
            jTable1.getColumnModel().getColumn(2).setResizable(false);
            jTable1.getColumnModel().getColumn(2).setPreferredWidth(1);
        }

        jButton3.setBackground(new java.awt.Color(34, 46, 80));
        jButton3.setFont(new java.awt.Font("Segoe UI", 3, 18)); // NOI18N
        jButton3.setForeground(new java.awt.Color(255, 255, 255));
        jButton3.setText("Delete Row");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGap(45, 45, 45)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 162, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 744, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(55, Short.MAX_VALUE))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGap(16, 16, 16)
                .addComponent(jScrollPane1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );

        jButton4.setBackground(new java.awt.Color(252, 203, 6));
        jButton4.setFont(new java.awt.Font("SansSerif", 1, 14)); // NOI18N
        jButton4.setForeground(new java.awt.Color(0, 0, 0));
        jButton4.setText("Next Student");

        jButton5.setBackground(new java.awt.Color(252, 203, 6));
        jButton5.setFont(new java.awt.Font("SansSerif", 1, 14)); // NOI18N
        jButton5.setForeground(new java.awt.Color(0, 0, 0));
        jButton5.setText("Previous Student");

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(114, 114, 114)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 192, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 192, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(58, 58, 58)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(jComboBox1, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 134, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 99, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jTextField1)
                            .addComponent(jTextField2)
                            .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 134, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                                .addComponent(jButton5)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 19, Short.MAX_VALUE)
                                .addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 142, javax.swing.GroupLayout.PREFERRED_SIZE)))))
                .addGap(58, 58, 58)
                .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, 49, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 45, Short.MAX_VALUE)
                .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 56, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(40, 40, 40)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 56, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(60, 60, 60))
            .addComponent(jPanel2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 12, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        pack();
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    String id = jTextField1.getText();
    String name = jTextField2.getText();
    String status = (String) jComboBox1.getSelectedItem(); 

    // Set label color based on status
    if (status.equals("Present")) {
        jComboBox1.setForeground(new java.awt.Color(0, 255, 0)); 
    } else {
        jComboBox1.setForeground(new java.awt.Color(255, 0, 0)); 
    }

    addTable(id, name, status);
    }                                        

    private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        loadStudentIDs();
    }                                           

    private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {                                           
        
    }                                          

    private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        loadStudentName();
    }                                           

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        DefaultTableModel model = (DefaultTableModel) jTable1.getModel();
        int selectedRow = jTable1.getSelectedRow();
        if (selectedRow >= 0) {
            model.removeRow(selectedRow);
        } else {
            JOptionPane.showMessageDialog(this, "No row selected to delete!", "Error", JOptionPane.WARNING_MESSAGE);
        }
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Instructor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Instructor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Instructor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Instructor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Instructor().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JComboBox<String> jComboBox1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    // End of variables declaration                   
}