what's the error in this for loop >> java netbeans

This is a method that displays the contents of the product in the table I did.

public void Show_Products_In_Jatable(){
    
    ArrayList<product> list = getProductList();
    DefaultTableModel model =  (DefaultTableModel) TTT.getModel();
    
    Object[] row = new Object[4];
    for (int i = 0; i<list.size() ; i++){
        
        row[0] = list.get(i).getId();
        row[1] = list.get(i).getName();
        row[2] = list.get(i).getPrice();
        row[3] = list.get(i).getAddDate();

        model.addRow(row);               
    }
}

But when I add or delete other products, it will automatically recur, as in the picture.

Maybe the problem is here

public ArrayList<product> getProductList() {

    ArrayList<product> productList = new ArrayList<product>();
    Connection con = getConnection();
    String query = "select * from products";

    Statement st;
    ResultSet rs;

    try {
        st = con.createStatement();
        rs = st.executeQuery(query);
        product product;
        
        while(rs.next()){
            product = new product(rs.getInt("id"), rs.getString("name"), Float.parseFloat(rs.getString("price")), rs.getString("add_date"), rs.getBytes("image"));
            productList.add(product);
        }
        
    } catch (SQLException ex) {
        Logger.getLogger(Main_Window.class.getName()).log(Level.SEVERE, null, ex);
    }
    return productList;
}

You will need to put the row declaration

Object[] row = new Object[4];

inside the for loop, otherwise you're creating just one single object which gets modified each time you cycle through the loop and eventually your "model" object will contain multiple references of the same object all over.

The whole row declaration and for loop would look a lot nicer if you replace it with lambdas though:

list.stream().forEach(i -> {
  model.addRow(new Object[] {
    i.getId(),
	i.getName(),
	i.getPrice(),
	i.getAddDate()
  });
});

Cheers!

Try this:

public void Show_Products_In_Jatable(){
    
    ArrayList<product> list = getProductList();
    DefaultTableModel model =  (DefaultTableModel) TTT.getModel();
    for (int i = 0; i<list.size() ; i++){
       Object[] row = new Object[4];  
       row[0] = list.get(i).getId();
       row[1] = list.get(i).getName();
       row[2] = list.get(i).getPrice();
       row[3] = list.get(i).getAddDate(); 
       model.addRow(row);             
    }
}