Form.java

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Label;
import java.awt.List;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.util.ArrayList;

public class Form extends Frame implements ActionListener, ItemListener {
    private Label lbMaSV, lbTen, lbNgaysinh, lbDiachi;
    private TextField tfMaSV, tfTen, tfNgaysinh, tfDiachi;
    private Button btAdd, btUpdate, btSave;
    private List listStudent;
    private ArrayList<Sinhvien> arrSV;

    public Form(String title) {
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.exit(0);
            }
        });
        this.setTitle(title);
        this.setLayout(new BorderLayout());

        Panel pnTop = new Panel();
        Label lbTitle = new Label("Form Quản Lý Sinh Viên");
        pnTop.add(lbTitle);
        this.add(pnTop, BorderLayout.PAGE_START);

        Panel pnLeft = new Panel();
        listStudent = new List();
        pnLeft.add(listStudent);
        this.add(listStudent, BorderLayout.LINE_START);

        Panel pnCenter = new Panel();
        pnCenter.setLayout(null);

        lbMaSV = new Label("Ma SV");
        lbTen = new Label("Ten");
        lbNgaysinh = new Label("Ngay sinh");
        lbDiachi = new Label("Dia chi");

        tfMaSV = new TextField(20);
        tfTen = new TextField(20);
        tfNgaysinh = new TextField(20);
        tfDiachi = new TextField(20);

        pnCenter.add(lbMaSV).setBounds(20, 20, 70, 23);
        pnCenter.add(tfMaSV).setBounds(100, 20, 150, 23);

        pnCenter.add(lbTen).setBounds(20, 50, 70, 23);
        pnCenter.add(tfTen).setBounds(100, 50, 150, 23);

        pnCenter.add(lbNgaysinh).setBounds(20, 80, 70, 23);
        pnCenter.add(tfNgaysinh).setBounds(100, 80, 150, 23);

        pnCenter.add(lbDiachi).setBounds(20, 110, 70, 23);
        pnCenter.add(tfDiachi).setBounds(100, 110, 150, 23);

        btAdd = new Button("Add");
        pnCenter.add(btAdd).setBounds(20, 150, 60, 23);

        btUpdate = new Button("Update");
        pnCenter.add(btUpdate).setBounds(105, 150, 60, 23);

        btSave = new Button("Save");
        pnCenter.add(btSave).setBounds(185, 150, 60, 23);

        this.add(pnCenter, BorderLayout.CENTER);

        arrSV = new ArrayList<Sinhvien>();
        btAdd.addActionListener(this);
        btUpdate.addActionListener(this);
        btSave.addActionListener(this);
        listStudent.addItemListener(this);

        try {
            Sinhvien test = new Sinhvien();
            FileInputStream fis = new FileInputStream("ksec.txt");
            ObjectInputStream in1 = new ObjectInputStream(fis);
            do {
                test = (Sinhvien) in1.readObject();
                listStudent.add(test.getMaSV());
                arrSV.add(new Sinhvien(test.getMaSV(), test.getTen(), test
                        .getNgaysinh(), test.getDiachi()));
            } while (test != null);
            in1.close();
        } catch (Exception e) {
            System.out.println("Error - Open");
        }
    }

    @Override
    public void actionPerformed(ActionEvent ae) {
        if (ae.getSource() == btAdd) {
            System.out.println("Add");
            listStudent.add(tfMaSV.getText());
            arrSV.add(new Sinhvien(tfMaSV.getText(), tfTen.getText(),
                    tfNgaysinh.getText(), tfDiachi.getText()));
        }

        if (ae.getSource() == btUpdate) {
            System.out.println("Update");
            int i = listStudent.getSelectedIndex();
            if (i != -1) {
                listStudent.remove(i);
                listStudent.add(tfMaSV.getText(), i);
                Sinhvien sv = (Sinhvien) arrSV.get(i);
                sv.setMaSV(tfMaSV.getText());
                sv.setTen(tfTen.getText());
                sv.setNgaysinh(tfNgaysinh.getText());
                sv.setDiachi(tfDiachi.getText());
            }
        }

        if (ae.getSource() == btSave) {
            System.out.println("Save");
            Sinhvien gf = new Sinhvien();
            gf.GhiFile("ksec.txt", arrSV);
        }
    }

    @Override
    public void itemStateChanged(ItemEvent e) {
        Sinhvien sv = (Sinhvien) arrSV.get(listStudent.getSelectedIndex());
        tfMaSV.setText(sv.getMaSV());
        tfTen.setText(sv.getTen());
        tfNgaysinh.setText(sv.getNgaysinh());
        tfDiachi.setText(sv.getDiachi());
    }

}