Java:删除DefaultTableModel的所有行

Question

我想删除DefaultTable的所有行.我发现了两种在Internet上删除它们的常用方法,但在我的情况下它们都不起作用,因为我的DefaultTableModel中不存在这些方法.我想知道为什么:S.我使用DefaultTableModel的代码是

DefaultTableModel Table =(DefaultTableModel)Table.getModel();

删除的一种方法是

Table.removeRow(Table.getRowCount() - 1);

但是这个removerow方法在我的DefaultTableModel中不存在.

请帮帮我.

Answer 1

您可以将行计数设置为0. setRowCount(0)

从文档引用:

public void setRowCount(int rowCount)

设置模型中的行数.如果新大小大于当前大小,则将新行添加到模型的末尾如果新大小小于当前大小,则丢弃索引rowCount和更大的所有行.

但是,你找不到removeRow我怀疑你没有输入模型变量 DefaultTableModel,也许只是TableModel？

在这种情况下,投你TableModel来DefaultTableModel是这样的:

DefaultTableModel model = (DefaultTableModel) table.getModel();

Answer 2

你试过这个对我有用吗

defaultTableModel.setRowCount(0);

Answer 3

为什么复杂的简单事情,但删除必须是迭代的,

if (myTableModel.getRowCount() > 0) {
    for (int i = myTableModel.getRowCount() - 1; i > -1; i--) {
        myTableModel.removeRow(i);
    }
}

代码示例

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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;

    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) {

            private static final long serialVersionUID = 1L;

            @Override
            public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
                Component c = super.prepareRenderer(renderer, row, column);
                int firstRow = 0;
                int lastRow = table.getRowCount() - 1;
                int width = 0;
                if (row == lastRow) {
                    ((JComponent) c).setBackground(Color.red);
                } else if (row == firstRow) {
                    ((JComponent) c).setBackground(Color.blue);
                } else {
                    ((JComponent) c).setBackground(table.getBackground());
                }
                /*if (!isRowSelected(row)) {
                String type = (String) getModel().getValueAt(row, 0);
                c.setBackground("Buy".equals(type) ? Color.GREEN : Color.YELLOW);
                }
                if (isRowSelected(row) && isColumnSelected(column)) {
                ((JComponent) c).setBorder(new LineBorder(Color.red));
                }*/
                return c;
            }
        };
        table.setPreferredScrollableViewportSize(table.getPreferredSize());
        JScrollPane scrollPane = new JScrollPane(table);
        add(scrollPane);
        JButton button1 = new JButton("Remove all rows");
        button1.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                if (model.getRowCount() > 0) {
                    for (int i = model.getRowCount() - 1; i > -1; i--) {
                        model.removeRow(i);
                    }
                }
                System.out.println("model.getRowCount() --->" + model.getRowCount());
            }
        });
        JButton button2 = new JButton("Add new rows");
        button2.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent arg0) {
                Object[] data0 = {"Buy", "IBM", new Integer(1000), new Double(80.50)};
                model.addRow(data0);
                Object[] data1 = {"Sell", "MicroSoft", new Integer(2000), new Double(6.25)};
                model.addRow(data1);
                Object[] data2 = {"Sell", "Apple", new Integer(3000), new Double(7.35)};
                model.addRow(data2);
                Object[] data3 = {"Buy", "Nortel", new Integer(4000), new Double(20.00)};
                model.addRow(data3);
                System.out.println("model.getRowCount() --->" + model.getRowCount());
            }
        });
        JPanel southPanel = new JPanel();
        southPanel.add(button1);
        southPanel.add(button2);
        add(southPanel, BorderLayout.SOUTH);
    }

    public static void main(String[] args) {
        RemoveAddRows frame = new RemoveAddRows();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

Answer 4

你为什么不读取DefaultTableModel的javadoc？

public void removeRow(int row)

从模型中删除行的行.正在删除的行的通知将发送给所有侦听器.

public void setDataVector(Vector dataVector,Vector columnIdentifiers)

使用新的行向量dataVector替换当前的dataVector实例变量.

public void setRowCount(int rowCount)

设置模型中的行数.如果新大小大于当前大小,则将新行添加到模型的末尾如果新大小小于当前大小,则丢弃索引rowCount和更大的所有行.