Java，在TableModel中编辑单元格后，字符串而不是double [英] Java, string instead of double after editing cell in TableModel

问题描述

我将CSV文件导入到DefaultTableModel中，其中一列的格式设置为double，到目前为止，效果很好.但是，如果我在JTable的此列(双精度)中编辑一个单元格，则此单元格不再是双精度型.现在它是一个字符串. 如何更改TableModel中已编辑单元格的类型? 我知道我可以使用double value = Double.parseDouble(str);将字符串解析为两倍，但是如何确保在编辑单元格后会发生这种情况?

I import a CSV file into a DefaultTableModel, one column is formatted as double, so far so good. But if I edit a cell from this column (double) in the JTable, after that this cell is no longer a double. Now it is a string. How can I change the type of the edited cell in the TableModel? I know that I can parse a string to double with double value = Double.parseDouble(str);, but how can I ensure that this happens after editing a cell?

我需要一个新的TableModel类吗?

class myTableModel extends DefaultTableModel { }

感谢您的帮助.

推荐答案

• 必须为所需的列覆盖getColumnClass
• have to override getColumnClass for required column(s)

例如

    @Override
    public Class<?> getColumnClass(int c) {
        if (c == 1) {
            return Short.class;
        } else {
            return Integer.class;
        }
    }

或

import javax.swing.*;
import javax.swing.table.*;

public class RemoveAddRows extends JFrame {

    private static final long serialVersionUID = 1L;
    private Object[] columnNames = {"Type", "Company", "Shares", "Price"};
    private Object[][] data = {
        {"Buy", "IBM", new Integer(1000), new Double(80.50)},
        {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)},
        {"Sell", "Apple", new Integer(3000), new Double(7.35)},
        {"Buy", "Nortel", new Integer(4000), new Double(20.00)}
    };
    private JTable table;
    private DefaultTableModel model;
    private javax.swing.Timer timer = null;

    public RemoveAddRows() {
        model = new DefaultTableModel(data, columnNames) {

            private static final long serialVersionUID = 1L;

            @Override
            public Class getColumnClass(int column) {
                return getValueAt(0, column).getClass();
            }
        };
        table = new JTable(model);        
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);        
    }



    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                RemoveAddRows frame = new RemoveAddRows();
                frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }
}

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