我必须在JTable中插入新产品,以便在按下“添加产品”按钮后,表应该自行更新提供的新数据。所有产品都写入文件并在打印出表格时从中读取。问题是我的表保持不变,只有在退出GUI应用程序并再次输入后,才能看到新的更新的JTable。JScrollPane没有正确更新
下面是从GUI类的相关代码:
private class ManageProductsListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
...
addProductBtn.addActionListener(new AddProductListener());
removeProductBtn.addActionListener(new RemoveProductListener());
manageProductsPanel.add(warehouse);
manageProductsPanel.setVisible(true);
finalPanel.add(manageProductsPanel, BorderLayout.CENTER);
}
}
private class AddProductListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
...
manageProductsPanel.remove(warehouse);
Product product = new Product(insertProductName.getText(), Integer.parseInt(insertPrice.getText()), Integer.parseInt(insertStock.getText()));
warehouse.addProduct(product);
warehouse.writeFile();
warehouse.printProducts();
manageProductsPanel.add(warehouse);
...
}
}
下面是从仓库类的一部分:
public class Warehouse extends JPanel {
...
private TreeSet<Product> products = new TreeSet<Product>();
private JTable productsTable;
private Object[][] data;
private String[] columns = {"Product name", "Price", "In stock", "Understock", "Overstock"};
public Warehouse() {
}
public void addProduct(Product newProduct) {
products.add(newProduct);
}
public void writeFile() {
try {
FileOutputStream fos = new FileOutputStream("products.txt");
ObjectOutputStream oos = new ObjectOutputStream(fos);
Iterator<Product> i = products.iterator();
while (i.hasNext()) {
oos.writeObject(i.next());
}
oos.close();
} catch (IOException i) {
i.printStackTrace();
}
}
public void readFile() {
...
}
public void printProducts() {
data = new Object[products.size()][5];
Iterator<Product> iterator = products.iterator();
int i = 0;
while (iterator.hasNext()) {
Product p = iterator.next();
data[i][0] = p.getProductName();
data[i][1] = p.getPrice();
data[i][2] = p.getStock();
data[i][3] = p.checkUnderstock();
data[i][4] = p.checkOverstock();
i++;
}
createTable();
}
public void createTable() {
productsTable = new JTable(data, columns);
productsTable.setPreferredScrollableViewportSize(new Dimension(600, 200));
productsTable.setFillsViewportHeight(true);
JScrollPane scroll = new JScrollPane(productsTable);
add(scroll);
}
任何帮助,将不胜感激。提前致谢!
是的,我已经尝试过了,但是当我把这个方法我不断收到新表。例如,如果我添加一个新产品,会出现一个新表;如果我添加另一个新产品,则会出现另一个新表格等等。新表格甚至不适合面板 – Dave
这似乎发生了,因为在createTable方法中添加了新表格,但不删除旧表格。 – Renatols
如何删除旧的? – Dave