对象/更新对象的java / TableModel“

Question

我有一组Stock对象，我正在实时更新大约10/15个变量。我通过集合中的ID访问每个Stock。我也试图在JTable中显示它并实现了AbstractTablemodel。它运作得不好。

我有一个RowMap，我将每个ID添加到，因为Stocks被添加到TableModel。要更新TableModel中所有股票的价格和变量，我想将Stock对象发送到updateModel（Stock s）方法。我可以通过搜索地图找到相关的行，但是如何很好地处理它，所以我不必开始迭代表列并将单元格的值与对象的变量进行比较以查看是否有任何行差异??

基本上，我想将Stock对象发送到TableModel并在有更改时更新单元格，如果没有则不执行任何操作。

有关如何实现可能执行此操作的TableModel的任何想法？任何诗人都会受到赞赏。

感谢。

编辑：

'import javax.swing.table.AbstractTableModel; import ppwebsitemonitor.views.OrderTableModel。*;

public final class QuoteTableModel扩展AbstractTableModel {

// Attributes
String[] columnName = new String[]{"Stock", "Quantity", "Price", "Side", "Status"};
Class[] columnClass =
        new Class[]{String.class, Integer.class, Double.class, String.class, String.class};
Object[][] rows = null;

public QuoteTableModel() {
}

public QuoteTableModel(Object[][] orders) {
    this.rows = orders;
}

public int getColumnCount() {
    return columnName.length;
}

public boolean isNew(int row) {
    return rows[row][4].equals(OrderStatus.NEW);
}

public boolean isFilled(int row) {
    return rows[row][4].equals(OrderStatus.FULLY_FILLED);
}

public boolean isCancelled(int row) {
    return rows[row][4].equals(OrderStatus.CANCELLED);
}

public void updateOrderPrice(int row, Double newPrice) {

    Object[] order = rows[row];
    order[2] = newPrice;
    super.fireTableRowsUpdated(row, row);
}

public void updateOrderStatus(int row, int status) {

    Object[] order = rows[row];
    order[4] = OrderStatus.States[status];
    super.fireTableRowsUpdated(row, row);
}

public Object getValueAt(int row, int col) {
    return rows[row][col];
}

public int getRowCount() {
    return rows.length;
}

public String getColumnName(int col) {
    return columnName[col];
}

public Class getColumnClass(int col) {
    return columnClass[col];
}

}“

Answer 1

您可以自行存储Stock对象，而不是将库存ID存储在表格模型中。您在主集合中保留的相同内容。然后每次更新库存值时将刷新发送到表UI（或者将其放在定时刷新或程序需要的任何内容上）。

修改

我要包含一些代码来说明我的意思。它几乎不会超过伪代码，你必须根据自己的情况进行调整。

这是为了模拟您的库存订单对象：

import java.io.Serializable;

public class StockOrder implements Serializable{
    public final class OrderStatus {
        public static final String NEW = "NEW";
        public static final String FULLY_FILLED = "FULLY_FILLED";
        public static final String SHIPPED = "SHIPPED";
        public static final String CANCELLED = "CANCELLED";
    }

    private static final long serialVersionUID = -3627357348101499053L;

    private String ticker;
    private Integer quantity;
    private Double price;
    private String side;
    private String status;

    public StockOrder() {
        super();
    }

    public StockOrder(String ticker, Integer quantity, Double price, String side, String status) {
        this();
        setTicker(ticker);
        setQuantity(quantity);
        setPrice(price);
        setSide(side);
        setStatus(status);
    }

    public Double getPrice() {
        return price;
    }

    public Integer getQuantity() {
        return quantity;
    }

    public String getSide() {
        return side;
    }

    public String getStatus() {
        return status;
    }

    public String getTicker() {
        return ticker;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public void setQuantity(Integer quantity) {
        this.quantity = quantity;
    }

    public void setSide(String side) {
        this.side = side;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public void setTicker(String ticker) {
        this.ticker = ticker;
    }
}

您的自定义模型如下所示：

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.swing.table.AbstractTableModel;

import misc.test.StockOrder.OrderStatus;

public class QuoteTableModel extends AbstractTableModel {

    private static final long serialVersionUID = -8683294701374710538L;

    // Attributes
    String[] columnName = new String[] { "Stock", "Quantity", "Price", "Side",
            "Status" };
    Class<?>[] columnClass = new Class[] { String.class, Integer.class,
            Double.class, String.class, String.class };
    private List<StockOrder> rows = null;
    private Map<String, Integer> orderMap = null;

    public QuoteTableModel() {
        super();
        setRows(new ArrayList<StockOrder>(8));
    }

    public QuoteTableModel(Collection<StockOrder> orders) {
        super();
        if(orders != null) {
            setRows(new ArrayList<StockOrder>(orders));
        } else {
            setRows(new ArrayList<StockOrder>(8));
        }
    }

    public int getColumnCount() {
        return columnName.length;
    }

    public boolean isNew(int row) {
        StockOrder order = getRows().get(row);
        return OrderStatus.NEW.equals(order.getStatus());
    }

    protected List<StockOrder> getRows() {
        return rows;
    }

    protected void setRows(List<StockOrder> rows) {
        this.rows = rows;
        this.orderMap = new HashMap<String, Integer>((rows != null) ? rows.size() : 8);

        if(rows != null) {
            int i = 0;
            for(StockOrder order: rows) {
                orderMap.put(order.getTicker(), new Integer(i++));
            }
        }
    }

    public boolean isFilled(int row) {
        StockOrder order = getRows().get(row);
        return OrderStatus.FULLY_FILLED.equals(order.getStatus());
    }

    public boolean isCancelled(int row) {
        StockOrder order = getRows().get(row);
        return OrderStatus.CANCELLED.equals(order.getStatus());
    }

    public void updateOrderPrice(int row, Double newPrice) {
        StockOrder order = getRows().get(row);
        if( order != null ) {
            order.setPrice(newPrice);
            super.fireTableRowsUpdated(row, row);
        }
    }

    public void updateOrderPrice(String ticker, Double newPrice) {
        Integer idx = getOrderMap().get(ticker);
        if(idx != null) {
            updateOrderPrice(idx, newPrice);
        }
    }

    public void updateOrderPrice(String ticker, String newStatus) {
        Integer idx = getOrderMap().get(ticker);
        if(idx != null) {
            updateOrderStatus(idx, newStatus);
        }
    }

    public void updateOrderStatus(int row, String newStatus) {
        StockOrder order = getRows().get(row);
        if( order != null ) {
            order.setStatus(newStatus);
            super.fireTableRowsUpdated(row, row);
        }

    }

    public Object getValueAt(int row, int col) {
        StockOrder order = getRows().get(row);
        if(order != null) {

            switch(col) {
                case 0: return order.getTicker() ;
                case 1: return order.getQuantity() ;
                case 2: return order.getPrice() ;
                case 3: return order.getSide() ;
                case 4: return order.getStatus() ;
                default: return "";
            }
        }

        return "";
    }

    public int getRowCount() {
        return getRows().size();
    }

    public String getColumnName(int col) {
        return columnName[col];
    }

    public Class<?> getColumnClass(int col) {
        return columnClass[col];
    }

    protected Map<String, Integer> getOrderMap() {
        return orderMap;
    }

    protected void setOrderMap(Map<String, Integer> orderMap) {
        this.orderMap = orderMap;
    }

}

您可以使用它来测试：

import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.TableModel;

import misc.test.StockOrder.OrderStatus;

public class QuoteTableApp {
    public static void main(String[] args) {
        QuoteTableApp app = new QuoteTableApp();
        System.out.println(app);
    }

    private JFrame frame = null;

    public QuoteTableApp() {
        super();
        setFrame(new JFrame("Quotes"));
        getFrame().setLocation(500, 300);
        getFrame().setSize(500, 400);

        List<StockOrder> orders = new ArrayList<StockOrder>(4);
        orders.add(new StockOrder("YHOO", 20, 73.50, "UP", OrderStatus.NEW));
        orders.add(new StockOrder("MSFT", 40, 42.00, "UP", OrderStatus.NEW));
        orders.add(new StockOrder("IBM", 100, 126.75, "UP", OrderStatus.NEW));
        orders.add(new StockOrder("CSCO", 5, 29.32, "UP", OrderStatus.NEW));

        TableModel model = new QuoteTableModel(orders);
        JTable table = new JTable(model);

        getFrame().getContentPane().add(table);
        getFrame().setVisible(Boolean.TRUE);

        ((QuoteTableModel) model).updateOrderPrice("CSCO", 31.20);
    }

    protected void setFrame(JFrame frame) {
        this.frame = frame;
    }

    protected JFrame getFrame() {
        return frame;
    }
}

此代码未考虑您可能需要执行的任何排序。但基本概念是存在的。希望这会有所帮助。