如何加入多个arraylists

Question

I have two different arraylists. In the first, there are vars (title,author,isbn,date,kind). In the second there are (title,author,isbn,date,kind,field) such as Strings. I dont use super class or subclass.Finally i want these arraylists to populate in common jtable When i run the program with the first arraylist i take this result 1st_arraylist When i run the program with the second arraylist i take this result 2st_arraylist When i run the program both of two arraylists i take this result both arraylists I want to view both arraylists in one jtable My code

public class LiteraryBookList {
        private ArrayList<LiteraryBook> LibookList;

        public LiteraryBookList() {
            LibookList = new ArrayList<LiteraryBook>();
        }

        public void add(LiteraryBook lb) {
            LibookList.add(lb);
        }

        public ArrayList<LiteraryBook> getBooks() {
            return LibookList;
        }

        public void readFromTxt(String filename) {
            File file = new File(filename);
            FileReader reader = null;
            try {
                reader = new FileReader(file);
            } catch (FileNotFoundException e) {
                System.exit(1);
            }
            BufferedReader infile = new BufferedReader(reader);
            String line = "";
            int counter = 0;
            String title = "";
            String author = "";
            String isbn = "";
            String date = "";
            String kind = "";

            try {
                while ((line = infile.readLine()) != null) {
                     if (line.isEmpty() || line.contains("1")) {
                        continue;
                     }
                    counter++;
                    if (counter == 1) {
                        title = line;
                    } else if (counter == 2) {
                        author = line;
                    } else if (counter == 3) {
                        isbn = line;
                    } else if (counter == 4) {
                        date = line;
                    } else if (counter == 5) {
                        kind = line;
                        LiteraryBook lb = new LiteraryBook(title, author, isbn, date, kind);
                        LibookList.add(lb);
                        counter = 0;

                    }

                }

            } catch (IOException ex) {
                Logger.getLogger(LiteraryBookList.class.getName()).log(Level.SEVERE, null, ex);
            }
        }

        public Object[][] convert2Data() {
            Object[][] data = new Object[LibookList.size()][5];
            for (int i = 0; i < LibookList.size(); i++) {
                data[i][0] = LibookList.get(i).getTitle();
                data[i][1] = LibookList.get(i).getAuthor();
                data[i][2] = LibookList.get(i).getIsbn();
                data[i][3] = LibookList.get(i).getDate();
                data[i][4] = LibookList.get(i).getKind();
            }
            return data;
        }
    }

Also i have..

public class ScientificBookList {

    private ArrayList<ScientificBook> ScibookList;

    public ScientificBookList() {
        ScibookList = new ArrayList<ScientificBook>();
    }

    public void add(ScientificBook sb) {
        ScibookList.add(sb);
    }

    public ArrayList<ScientificBook> getBooks() {
        return ScibookList;
    }

    public void readFromTxt(String filename) {
        File file = new File(filename);
        FileReader reader = null;
        try {
            reader = new FileReader(file);
        } catch (FileNotFoundException e) {
            System.exit(1);
        }
        BufferedReader infile = new BufferedReader(reader);
        String line = "";
        int counter = 0;
        String sci_title = "";
        String sci_author = "";
        String sci_isbn = "";
        String sci_date = "";
        String sci_kind = "";
        String scientific_field = "";

        try {
            while ((line = infile.readLine()) != null) {
                if (line.isEmpty() || line.contains("2")) {
                    continue;
                }

                counter++;
                if (counter == 1) {
                    sci_title = line;
                } else if (counter == 2) {
                    sci_author = line;
                } else if (counter == 3) {
                    sci_isbn = line;
                } else if (counter == 4) {
                    sci_date = line;
                } else if (counter == 5) {
                    sci_kind = line;
                } else if (counter == 6) {
                    scientific_field = line;

                    ScientificBook sb = new ScientificBook(sci_title, sci_author, sci_isbn, sci_date, sci_kind,scientific_field);
                    ScibookList.add(sb);
                    counter = 0;

                }

            }

        } catch (IOException ex) {
            Logger.getLogger(LiteraryBookList.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public Object[][] convert2Data() {
        Object[][] data = new Object[ScibookList.size()][6];
        for (int i = 0; i < ScibookList.size(); i++) {
            data[i][0] = ScibookList.get(i).getSci_Title();
            data[i][1] = ScibookList.get(i).getSci_Author();
            data[i][2] = ScibookList.get(i).getSci_Isbn();
            data[i][3] = ScibookList.get(i).getSci_Date();
            data[i][4] = ScibookList.get(i).getSci_Kind();
            data[i][5] = ScibookList.get(i).getScientific_field();

        }
        return data;
    }

}

Finally i have

public class ShowBooks extends JFrame {

    private Object[][] data;
    private String[] columnNames = {"Title", "Author", "Isbn", "Date", "Kind", "Field"};
    private DefaultTableModel tableModel;
    private JTable table;

    private LiteraryBookList myList1;
    private ScientificBookList myList2;


    public ShowBooks() {

        setBounds(10, 10, 400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        myList1 = new LiteraryBookList();
        myList2 = new ScientificBookList();

        myList1.readFromTxt("test.txt");
        myList2.readFromTxt("test.txt");

        data = myList1.convert2Data();
        data = myList2.convert2Data();

        tableModel = new DefaultTableModel(data, columnNames);

        table = new JTable(tableModel);
        table.setAutoCreateRowSorter(true);
        JScrollPane scrollPane = new JScrollPane(table);
        scrollPane.setPreferredSize(new Dimension(380, 280));
        JPanel panel = new JPanel();
        panel.add(scrollPane);
        add(panel, BorderLayout.CENTER);
    }

}

Answer 1

This could be a dirty solution somewhat duplicating convert2Data methods which should not be called at all:

// prepare one large array to contain both types of books
data = new Object[myList1.getBooks().size() + myList2.getBooks().size()][6];

int row = 0;
// fill 2D array with scientific books' data
for (ScientificBook book : myList1.getBooks()) {
    data[row][0] = book.getSci_Title();
    data[row][1] = book.getSci_Author();
    data[row][2] = book.getSci_Isbn();
    data[row][3] = book.getSci_Date();
    data[row][4] = book.getSci_Kind();
    data[row][5] = book.getScientific_field();
    row++;
}

// fill 2D array with literary books' data
for (LiteraryBook book : myList2.getBooks()) {
    data[row][0] = book.getTitle();
    data[row][1] = book.getAuthor();
    data[row][2] = book.getIsbn();
    data[row][3] = book.getDate();
    data[row][4] = book.getKind();
    data[row][5] = "";
    row++;
}

Though it's highly recommended to redesign your classes and remove duplicated/ unnecessary code.