java - 刷新框架上的表行(不是行的值)？

Question

抱歉，我太业余了，我在框架上创建了一个“按钮”，这样当我们第一次单击该按钮时，就会在框架上插入一行。但我想要的是，当我第二次单击按钮时，行被刷新(不是创建新行!)，我知道 '.addRow(new Object[] { "", "", ""}) ;'原因是，因为每次单击按钮时都会创建对象，所以我怎么可能修改代码呢？感谢您的关注。

*我弱小的大脑说，如果我可以清空“模型”对象(或销毁该对象，类似的东西)，那么我就能找到解决方案，但是我怎么可能清空/销毁该“模型”对象呢？

import javax.swing.*;
import java.awt.event.*;
import javax.swing.table.DefaultTableModel;

public class MyTable extends JFrame {

    private JTable table;
    private DefaultTableModel model;
    private JScrollPane scroll;
    private JButton createRow;
    private String headers[] = {"a", "b", "c"};

    public MyTable() {
        createRow = new JButton("Create Row");
        model = new DefaultTableModel();
        model.setColumnIdentifiers(headers);
        table = new JTable();
        table.setModel(model);
        scroll = new JScrollPane(table);
        add(createRow, java.awt.BorderLayout.NORTH);
        add(scroll, java.awt.BorderLayout.CENTER);
        createRowOn();
    }

    // while button is pressed then create A ROW
    public void createRowOn() {
        createRow.addActionListener(
                new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (e.getSource() == createRow) {
                    model.addRow(new Object[]{"", "", ""});
                }
            }
        });
    }

    public static void main(String args[]) {
        MyTable t = new MyTable();
        t.setVisible(true);
        t.setSize(300, 300);
    }
}

Answer 1

Sorry for being so amateur

• 请阅读 Oracle 教程 How to use Tables ，尤其是 Creating Table Model 部分

I created a 'button' on frame so that when we click the button for the first time, A ROW will be inserted on frame. But all i want that when i click the button on THE SECOND TIME , the ROW IS REFRESHED (Not creating a new row !) , i suspect 'new Object[] { "", "", ""}' is the cause , because the object is created everytime i click the button, so how could i possibly modify the code ?

• 如果您想的话，问题不清楚(没有任何内容添加到 JTable 中):

  1. 添加新行(model.addRow)

  2. 删除所有行(setDataVector/setRowCount)

  3. 在 JTables View 中重置值 (setValueAt)

  但是Oracle教程中已经描述了所有内容，其余的在DefaultTableModel中