FILE: Bài tập quản lý sinh viên bằng Java Swing + File

#StudentFrame.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.bt113;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;

/**
 *
 * @author Diep.Tran
 */
public class StudentFrame extends javax.swing.JFrame {
    List<Student> stdList;
    
    /**
     * Creates new form StudentFrame
     */
    public StudentFrame() {
        initComponents();
        
        stdList = new ArrayList<>();
        
        loadFiles();
    }
    
    private void loadFiles() {
        FileReader reader = null;
        BufferedReader bReader = null;
        
        try {
            reader = new FileReader("students.txt");
            bReader = new BufferedReader(reader);
            
            String line = null;
            while((line = bReader.readLine()) != null) {
                if(line.isEmpty()) continue;
                
                Student std = new Student();
                std.parse(line);
                
                stdList.add(std);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(bReader != null) {
                try {
                    bReader.close();
                } catch (IOException ex) {
                    Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(reader != null) {
                try {
                    reader.close();
                } catch (IOException ex) {
                    Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        txtFullname = new javax.swing.JTextField();
        txtGender = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        txtRollNo = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        txtEmail = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();
        txtAddress = new javax.swing.JTextField();
        jLabel5 = new javax.swing.JLabel();
        btnSearch = new javax.swing.JButton();
        btnUpdate = new javax.swing.JButton();
        btnReset = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Ho & Ten:");

        jLabel2.setText("Gioi Tinh:");

        jLabel3.setText("RollNo:");

        jLabel4.setText("Email:");

        jLabel5.setText("Dia Chi:");

        btnSearch.setText("Search");
        btnSearch.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnSearchActionPerformed(evt);
            }
        });

        btnUpdate.setText("Update");
        btnUpdate.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnUpdateActionPerformed(evt);
            }
        });

        btnReset.setText("Reset");
        btnReset.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnResetActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(40, 40, 40)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel4)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(txtEmail, javax.swing.GroupLayout.PREFERRED_SIZE, 282, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(txtRollNo, javax.swing.GroupLayout.PREFERRED_SIZE, 282, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel1)
                            .addComponent(jLabel2))
                        .addGap(60, 60, 60)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(txtGender, javax.swing.GroupLayout.PREFERRED_SIZE, 282, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(txtFullname, javax.swing.GroupLayout.PREFERRED_SIZE, 282, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addComponent(jLabel5)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(btnUpdate)
                                .addGap(18, 18, 18)
                                .addComponent(btnReset))
                            .addComponent(txtAddress, javax.swing.GroupLayout.PREFERRED_SIZE, 282, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addGap(18, 18, 18)
                .addComponent(btnSearch, javax.swing.GroupLayout.PREFERRED_SIZE, 105, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(17, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(26, 26, 26)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(txtFullname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnSearch))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(txtGender, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(txtRollNo, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(txtEmail, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(txtAddress, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(btnUpdate)
                    .addComponent(btnReset))
                .addContainerGap(25, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void btnUpdateActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnUpdateActionPerformed
        // TODO add your handling code here:
        String fullname = txtFullname.getText().toString();
        String gender = txtGender.getText().toString();
        String rollno = txtRollNo.getText().toString();
        String email = txtEmail.getText().toString();
        String address = txtAddress.getText().toString();
        
        Student std = new Student(fullname, gender, rollno, email, address);
        boolean isFind = false;
        for (int i = 0; i < stdList.size(); i++) {
            if(stdList.get(i).getRollno().equalsIgnoreCase(rollno)) {
                isFind = true;
                stdList.set(i, std);
                break;
            }
        }
        if(!isFind) {
            stdList.add(std);
        }
        
        saveFiles();
        
        btnResetActionPerformed(null);
    }//GEN-LAST:event_btnUpdateActionPerformed

    private void saveFiles() {
        FileWriter writer = null;
        BufferedWriter bWriter = null;
        
        try {
            writer = new FileWriter("students.txt");
            bWriter = new BufferedWriter(writer);
            
            for (Student student : stdList) {
                bWriter.write(student.toString());
            }
        } catch (IOException ex) {
            Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(bWriter != null) {
                try {
                    bWriter.close();
                } catch (IOException ex) {
                    Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(writer != null) {
                try {
                    writer.close();
                } catch (IOException ex) {
                    Logger.getLogger(StudentFrame.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    private void btnResetActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnResetActionPerformed
        // TODO add your handling code here:
        txtFullname.setText("");
        txtGender.setText("");
        txtRollNo.setText("");
        txtEmail.setText("");
        txtAddress.setText("");
    }//GEN-LAST:event_btnResetActionPerformed

    private void btnSearchActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnSearchActionPerformed
        // TODO add your handling code here:
        if(txtRollNo.getText().toString().isEmpty()) {
            JOptionPane.showMessageDialog(rootPane, "Nhap thong tin msv can tim kiem");
            return;
        }
        
        String rollno = txtRollNo.getText().toString();
        boolean isFind = false;
        for (Student student : stdList) {
            if(student.getRollno().equalsIgnoreCase(rollno)) {
                isFind = true;
                txtFullname.setText(student.getFullname());
                txtGender.setText(student.getGender());
                txtRollNo.setText(student.getRollno());
                txtEmail.setText(student.getEmail());
                txtAddress.setText(student.getAddress());
                break;
            }
        }
        
        if(!isFind) {
            JOptionPane.showMessageDialog(rootPane, "Khong tim thay sinh vien nao co msv = " + rollno);
        }
    }//GEN-LAST:event_btnSearchActionPerformed

    /**
     * @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(StudentFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(StudentFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(StudentFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(StudentFrame.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 StudentFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton btnReset;
    private javax.swing.JButton btnSearch;
    private javax.swing.JButton btnUpdate;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JTextField txtAddress;
    private javax.swing.JTextField txtEmail;
    private javax.swing.JTextField txtFullname;
    private javax.swing.JTextField txtGender;
    private javax.swing.JTextField txtRollNo;
    // End of variables declaration//GEN-END:variables
}

#StudentFrame.form

<?xml version="1.0" encoding="UTF-8" ?>

<Form version="1.3" maxVersion="1.9" type="org.netbeans.modules.form.forminfo.JFrameFormInfo">
  <Properties>
    <Property name="defaultCloseOperation" type="int" value="3"/>
  </Properties>
  <SyntheticProperties>
    <SyntheticProperty name="formSizePolicy" type="int" value="1"/>
    <SyntheticProperty name="generateCenter" type="boolean" value="false"/>
  </SyntheticProperties>
  <AuxValues>
    <AuxValue name="FormSettings_autoResourcing" type="java.lang.Integer" value="0"/>
    <AuxValue name="FormSettings_autoSetComponentName" type="java.lang.Boolean" value="false"/>
    <AuxValue name="FormSettings_generateFQN" type="java.lang.Boolean" value="true"/>
    <AuxValue name="FormSettings_generateMnemonicsCode" type="java.lang.Boolean" value="false"/>
    <AuxValue name="FormSettings_i18nAutoMode" type="java.lang.Boolean" value="false"/>
    <AuxValue name="FormSettings_layoutCodeTarget" type="java.lang.Integer" value="1"/>
    <AuxValue name="FormSettings_listenerGenerationStyle" type="java.lang.Integer" value="0"/>
    <AuxValue name="FormSettings_variablesLocal" type="java.lang.Boolean" value="false"/>
    <AuxValue name="FormSettings_variablesModifier" type="java.lang.Integer" value="2"/>
  </AuxValues>

  <Layout>
    <DimensionLayout dim="0">
      <Group type="103" groupAlignment="0" attributes="0">
          <Group type="102" alignment="0" attributes="0">
              <EmptySpace min="-2" pref="40" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="0" max="-2" attributes="0">
                  <Group type="102" alignment="1" attributes="0">
                      <Component id="jLabel4" min="-2" max="-2" attributes="0"/>
                      <EmptySpace max="32767" attributes="0"/>
                      <Component id="txtEmail" min="-2" pref="282" max="-2" attributes="0"/>
                  </Group>
                  <Group type="102" alignment="1" attributes="0">
                      <Component id="jLabel3" min="-2" max="-2" attributes="0"/>
                      <EmptySpace max="32767" attributes="0"/>
                      <Component id="txtRollNo" min="-2" pref="282" max="-2" attributes="0"/>
                  </Group>
                  <Group type="102" alignment="1" attributes="0">
                      <Group type="103" groupAlignment="0" attributes="0">
                          <Component id="jLabel1" alignment="0" min="-2" max="-2" attributes="0"/>
                          <Component id="jLabel2" alignment="0" min="-2" max="-2" attributes="0"/>
                      </Group>
                      <EmptySpace min="-2" pref="60" max="-2" attributes="0"/>
                      <Group type="103" groupAlignment="0" attributes="0">
                          <Component id="txtGender" min="-2" pref="282" max="-2" attributes="0"/>
                          <Component id="txtFullname" min="-2" pref="282" max="-2" attributes="0"/>
                      </Group>
                  </Group>
                  <Group type="102" alignment="1" attributes="0">
                      <Component id="jLabel5" min="-2" max="-2" attributes="0"/>
                      <EmptySpace max="32767" attributes="0"/>
                      <Group type="103" groupAlignment="0" attributes="0">
                          <Group type="102" attributes="0">
                              <Component id="btnUpdate" min="-2" max="-2" attributes="0"/>
                              <EmptySpace type="separate" max="-2" attributes="0"/>
                              <Component id="btnReset" min="-2" max="-2" attributes="0"/>
                          </Group>
                          <Component id="txtAddress" min="-2" pref="282" max="-2" attributes="0"/>
                      </Group>
                  </Group>
              </Group>
              <EmptySpace type="separate" max="-2" attributes="0"/>
              <Component id="btnSearch" min="-2" pref="105" max="-2" attributes="0"/>
              <EmptySpace pref="17" max="32767" attributes="0"/>
          </Group>
      </Group>
    </DimensionLayout>
    <DimensionLayout dim="1">
      <Group type="103" groupAlignment="0" attributes="0">
          <Group type="102" alignment="0" attributes="0">
              <EmptySpace min="-2" pref="26" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="3" attributes="0">
                  <Component id="jLabel1" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="txtFullname" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="btnSearch" alignment="3" min="-2" max="-2" attributes="0"/>
              </Group>
              <EmptySpace type="separate" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="3" attributes="0">
                  <Component id="jLabel2" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="txtGender" alignment="3" min="-2" max="-2" attributes="0"/>
              </Group>
              <EmptySpace type="separate" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="3" attributes="0">
                  <Component id="jLabel3" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="txtRollNo" alignment="3" min="-2" max="-2" attributes="0"/>
              </Group>
              <EmptySpace type="separate" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="3" attributes="0">
                  <Component id="jLabel4" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="txtEmail" alignment="3" min="-2" max="-2" attributes="0"/>
              </Group>
              <EmptySpace type="separate" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="3" attributes="0">
                  <Component id="jLabel5" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="txtAddress" alignment="3" min="-2" max="-2" attributes="0"/>
              </Group>
              <EmptySpace type="separate" max="-2" attributes="0"/>
              <Group type="103" groupAlignment="3" attributes="0">
                  <Component id="btnUpdate" alignment="3" min="-2" max="-2" attributes="0"/>
                  <Component id="btnReset" alignment="3" min="-2" max="-2" attributes="0"/>
              </Group>
              <EmptySpace pref="25" max="32767" attributes="0"/>
          </Group>
      </Group>
    </DimensionLayout>
  </Layout>
  <SubComponents>
    <Component class="javax.swing.JLabel" name="jLabel1">
      <Properties>
        <Property name="text" type="java.lang.String" value="Ho &amp; Ten:"/>
      </Properties>
    </Component>
    <Component class="javax.swing.JTextField" name="txtFullname">
    </Component>
    <Component class="javax.swing.JTextField" name="txtGender">
    </Component>
    <Component class="javax.swing.JLabel" name="jLabel2">
      <Properties>
        <Property name="text" type="java.lang.String" value="Gioi Tinh:"/>
      </Properties>
    </Component>
    <Component class="javax.swing.JTextField" name="txtRollNo">
    </Component>
    <Component class="javax.swing.JLabel" name="jLabel3">
      <Properties>
        <Property name="text" type="java.lang.String" value="RollNo:"/>
      </Properties>
    </Component>
    <Component class="javax.swing.JTextField" name="txtEmail">
    </Component>
    <Component class="javax.swing.JLabel" name="jLabel4">
      <Properties>
        <Property name="text" type="java.lang.String" value="Email:"/>
      </Properties>
    </Component>
    <Component class="javax.swing.JTextField" name="txtAddress">
    </Component>
    <Component class="javax.swing.JLabel" name="jLabel5">
      <Properties>
        <Property name="text" type="java.lang.String" value="Dia Chi:"/>
      </Properties>
    </Component>
    <Component class="javax.swing.JButton" name="btnSearch">
      <Properties>
        <Property name="text" type="java.lang.String" value="Search"/>
      </Properties>
      <Events>
        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="btnSearchActionPerformed"/>
      </Events>
    </Component>
    <Component class="javax.swing.JButton" name="btnUpdate">
      <Properties>
        <Property name="text" type="java.lang.String" value="Update"/>
      </Properties>
      <Events>
        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="btnUpdateActionPerformed"/>
      </Events>
    </Component>
    <Component class="javax.swing.JButton" name="btnReset">
      <Properties>
        <Property name="text" type="java.lang.String" value="Reset"/>
      </Properties>
      <Events>
        <EventHandler event="actionPerformed" listener="java.awt.event.ActionListener" parameters="java.awt.event.ActionEvent" handler="btnResetActionPerformed"/>
      </Events>
    </Component>
  </SubComponents>
</Form>

#Student.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.bt113;

/**
 *
 * @author Diep.Tran
 */
public class Student {
    String fullname, gender, rollno, email, address;

    public Student() {
    }

    public Student(String fullname, String gender, String rollno, String email, String address) {
        this.fullname = fullname;
        this.gender = gender;
        this.rollno = rollno;
        this.email = email;
        this.address = address;
    }

    public String getFullname() {
        return fullname;
    }

    public void setFullname(String fullname) {
        this.fullname = fullname;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getRollno() {
        return rollno;
    }

    public void setRollno(String rollno) {
        this.rollno = rollno;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
    
    @Override
    public String toString() {
        return fullname + "," + gender + "," + 
                rollno + "," + email+"," + address + "\n";
    }
    
    public void parse(String line) {
        if(line == null || line == "") return;
        
        String[] elements = line.split(",");
        if(elements.length < 5) return;
        
        fullname = elements[0];
        gender = elements[1];
        rollno = elements[2];
        email = elements[3];
        address = elements[4];
    }
}