GiFile

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package L05;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Anh-Kool
 */
public class GiFile {

    public String file = "data121.txt";

    void write(ArrayList<Student> students) {
        try {
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file, true));
            oos.writeObject(students);
            oos.close();
        } catch (IOException ex) {
            System.out.println("Ghi file loi");
        }
    }

    ArrayList<Student> read() {
        ArrayList<Student> students = new ArrayList<Student>();
        File file1 = new File(file);
        try {
            if (file1 != null) {
                FileInputStream fis = new FileInputStream(file);
                ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
                students = (ArrayList<Student>) ois.readObject();
            }
        } catch (IOException ex) {
            Logger.getLogger(GiFile.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(GiFile.class.getName()).log(Level.SEVERE, null, ex);
        }
        return students;
    }
}