如何将包含对象的集合从另一个类移动到抽象表模型类

Question

我的抽象表模型有问题，当我要将数据从数据库填充到我的抽象表模型时，我不明白如何将数据从数据库移动到我的抽象表模型，这是我从数据库获取数据的语法：

public class UserJavaToDatabase {

    public User getUser(int id) {
        Connection koneksi = Koneksi.buka_koneksi();
        try {
            Statement stmt = koneksi.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM user WHERE id ="+id);

            if (rs.next()){
                User user = new User();

                return extractUserFromResultSet(rs);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    return null; 
    }

    private User extractUserFromResultSet(ResultSet rs) throws SQLException{
        User user = new User();

        user.setID(rs.getInt("id_user_perpus"));
        user.setNim(rs.getString("nim_user_perpus"));
        user.setNama(rs.getString("nama_user_perpus"));
        user.setProdi(rs.getString("prodi_user_perpus"));
        user.setUserPinjam(rs.getInt("user_pinjam"));
        user.setPassword(rs.getString("password_user_perpus"));

        return user;
    }

    private Admin extractAdminFromResultSet(ResultSet rs) throws SQLException{
        Admin admin = new Admin();
        admin.setId(rs.getInt("id_admin"));
        admin.setNik(rs.getString("nik_admin"));
        admin.setPassword(rs.getString("password_admin"));
        return admin;
    }


    public ArrayList getAllUser() {
        Connection koneksi = Koneksi.buka_koneksi();
        try {
            Statement stmt = koneksi.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM user");

            ArrayList users = new ArrayList();

            while (rs.next()){
                User user = extractUserFromResultSet(rs);
                users.add(user);
            }
            return users;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    public User getUserByUserNameAndPassword(String nim) {
        Connection koneksi = Koneksi.buka_koneksi();
        try {
                PreparedStatement ps = koneksi.prepareStatement("SELECT * FROM user WHERE nim_user_perpus=? AND password_user_perpus=?");
                ps.setString(1, nim);
                ps.setString(2, nim);
                ResultSet rs = ps.executeQuery();

                if (rs.next()){
                    return extractUserFromResultSet(rs);
                }
        } catch (Exception e) {
            e.printStackTrace();
        }        
        return null;
    }

    public Admin getAdminByUserNameAndPassword(String nik, String password){
        Connection koneksi = Koneksi.buka_koneksi();
        try {
            PreparedStatement ps = koneksi.prepareStatement("SELECT * FROM admin WHERE nik_admin=? AND password_admin=?");
            ps.setString(1, nik);
            ps.setString(2, password);
            ResultSet rs = ps.executeQuery();

            if(rs.next()){
                return extractAdminFromResultSet(rs);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    public boolean insertUser(User user) {
        Connection koneksi = Koneksi.buka_koneksi();
        try {
            PreparedStatement ps = koneksi.prepareStatement("INSERT INTO user(nim_user_perpus, nama_user_perpus, prodi_user_perpus, password_user_perpus) VALUES (?,?,?,?)");
            ps.setString(1, user.getNim());
            ps.setString(2, user.getNama());
            ps.setString(3, user.getProdi());
            ps.setString(4, user.getPassword());

            int i = ps.executeUpdate();

            if (i == 1){
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    public boolean updateUser(User user) {
        Connection koneksi = Koneksi.buka_koneksi();

        try {
            PreparedStatement ps = koneksi.prepareStatement("UPDATE user SET nim_user_perpus=?, nama_user_perpus=?, prodi_user_perpus=?, user_pinjam=? WHERE id=?");
            ps.setString(1, user.getNim());
            ps.setString(2, user.getNama());
            ps.setString(3, user.getProdi());
            ps.setInt(4, user.getUserPinjam());
            ps.setString(5, user.getPassword());
            ps.setInt(6, user.getID());

            int i = ps.executeUpdate();

            if (i == 1){
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }


    public boolean deleteUser(int id) {
        Connection koneksi = Koneksi.buka_koneksi();

        try {
            Statement stmt = koneksi.createStatement();
            int i = stmt.executeUpdate("DELETE FROM user WHERE id="+id);
            if(i == 1){
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }
}

这是我从数据库中获取数据的方法。

public Set getAllUser() {
    Connection koneksi = Koneksi.buka_koneksi();
    try {
        Statement stmt = koneksi.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT * FROM user");

        Set users = new HashSet();

        while (rs.next()){
            User user = extractUserFromResultSet(rs);
            users.add(user);
        }
        return users;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

这是我在jFrame中创建表的抽象表模型代码。

public class userTableModel extends AbstractTableModel {

    private String [] columnNames = {"ID","Nim","Nama","Prodi","Jumlah Peminjaman"};
    private Object [][] data = {{}}; //This should inputed from getAllUser() in UserJavaToDatabase class

    @Override
    public int getRowCount() {
        return data.length;
    }

    @Override
    public int getColumnCount() {
        return columnNames.length;
    }

    @Override
    public Object getValueAt(int rowIndex, int columnIndex) {
        return data[rowIndex][columnIndex];
    }

    @Override
    public Class<?> getColumnClass(int c) {
        return getValueAt(0, c).getClass();
    }

    @Override
    public String getColumnName(int column) {
        return columnNames[column]; //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public boolean isCellEditable(int row, int column)
    {
        if (column == 1 || column == 2){
            return false;
        }else
            return true;
    }
}

这是我的用户类别：

public class User {
    private String nim, nama, prodi, password;
    private int ID,userPinjam;

    public User(){

    }

    public User(String nim){
        this.nim = nim;
    }

    public User(String nim, String password){
        this.nim = nim;
        this.password = password;
    }

    public User(String nim, String nama, String prodi){
        this.nim = nim;
        this.nama = nama;
        this.prodi = prodi;
        this.password = nim;
    }

    public String getNim() {
        return nim;
    }

    public String getNama() {
        return nama;
    }

    public String getProdi() {
        return prodi;
    }

    public String getPassword() {
        return password;
    }

    public int getID() {
        return ID;
    }

    public int getUserPinjam() {
        return userPinjam;
    }

    public void setNim(String nim) {
        this.nim = nim;
    }

    public void setNama(String nama) {
        this.nama = nama;
    }

    public void setProdi(String prodi) {
        this.prodi = prodi;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setID(int ID) {
        this.ID = ID;
    }

    public void setUserPinjam(int userPinjam) {
        this.userPinjam = userPinjam;
    }

}