DefaultTableModel数据从以前编辑的单元格移动

Question

public class CheckoutTableModel extends DefaultTableModel {

    private String[] columnNames= {"Brand","Model","Price","Quantity","Total Price"};
    private List<Integer> id;
    private List<CheckoutItem> basketItems;
    private static final long serialVersionUID = 7944308974044321712L;


    public CheckoutTableModel()
    {
        id=new ArrayList<>();
        basketItems=new ArrayList<>();
    }

    public CheckoutTableModel(List<Item>db, ArrayList<Integer>quantity)
    {
        id=new ArrayList<>();
        basketItems=new ArrayList<>();
        for (int i = 0 ; i < db.size() ; i++)
        {
            basketItems.add(new CheckoutItem(db.get(i).getBrand(), db.get(i).getModel(), db.get(i).getPrice(), quantity.get(i)));
        }
    }

    public void setValueAt(Object value, int row, int column)
    {
        switch(column)
        {
        case 1: 
            basketItems.get(row).setBrand((String)value);
        case 2:
            basketItems.get(row).setModel((String)value);
        case 3:
            basketItems.get(row).setPrice((double)value);
        case 4:
            basketItems.get(row).setQuantity(Integer.parseInt((String) value));
        case 5:
            basketItems.get(row).setTotalPrice(Double.parseDouble((String) value));
        }
    }

    public int getRowCount() {
        if(basketItems==null)
        {
            return 0;
        }
        else
        return basketItems.size();
    }

    public int getColumnCount() {
        return 5;
    }

    public String getColumnName(int column) {
        return columnNames[column];
    }

    public Object getValueAt(int row, int column) {  //set values of cells
        switch(column)
        {
        case 0: 
            return basketItems.get(row).getBrand();
        case 1:
            return basketItems.get(row).getModel();
        case 2:
            return basketItems.get(row).getPrice();
        case 3:
            return basketItems.get(row).getQuantity();
        case 4:
            return basketItems.get(row).getTotalPrice();
        }
        return null;
    }

    public void setTableModel(List<Item>db, List<Integer>quantities){
        id=new ArrayList<>();
        basketItems=new ArrayList<>();
        for (int i = 0 ; i < db.size() ; i++)
        {
            basketItems.add(new CheckoutItem(db.get(i).getBrand(), db.get(i).getModel(), db.get(i).getPrice(), quantities.get(i)));
        }
    }

    public boolean isCellEditable(int row,int column)  
        {
            switch(column){             

           case 0:  // select the cell you want make it not editable 
             return false; 
           case 1:  // select the cell you want make it not editable 
               return false;
           case 2:
               return true;
           case 3:
               return true;
           case 4:
               return false;
         default: return false;}  
     }

     @SuppressWarnings("unchecked")
     public Class getColumnClass(int column) {
            return getValueAt(0, column).getClass();
     }
}

Answer 1

因此，您的setvalueat方法中至少存在两个问题...

1. 列（和行）被0索引
2. switch语句将允许执行一个case和下面的所有子case...

所以，这意味着...

public void setValueAt(Object value, int row, int column)
{
    switch(column)
    {
    case 1: 
        basketItems.get(row).setBrand((String)value);
    case 2:
        basketItems.get(row).setModel((String)value);
    case 3:
        basketItems.get(row).setPrice((double)value);
    case 4:
        basketItems.get(row).setQuantity(Integer.parseInt((String) value));
    case 5:
        basketItems.get(row).setTotalPrice(Double.parseDouble((String) value));
    }
}

public void setValueAt(Object value, int row, int column)
{
    switch(column)
    {
    case 0: 
        basketItems.get(row).setBrand((String)value);
        break;
    case 1:
        basketItems.get(row).setModel((String)value);
        break;
    case 2:
        basketItems.get(row).setPrice((double)value);
        break;
    case 3:
        basketItems.get(row).setQuantity(Integer.parseInt((String) value));
        break;
    case 4:
        basketItems.get(row).setTotalPrice(Double.parseDouble((String) value));
        break;
    }
}