import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Demo extends JFrame {//窗体类
    private DefaultTableModel model;//表格模型
    private JTable table;//表格
    private JButton addButton, delButton, updButton;//增删改三个按钮
    private JTextField aTextField, bTextField;//按钮旁边的输入框
 
    public Demo() {//窗体构造方法
        setTitle("表格模型");
        setBounds(100, 100, 400, 200);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        String[] columnNames = {"A", "B"};//定义表格列名
        String[][] tableValues = {{"A1", "B1"}, {"A2", "B2"}, {"A3", "B3"}};//表格内容
        model = new DefaultTableModel(tableValues, columnNames);//设置模型
        table = new JTable(model);//引用模型，或table.setModel(model);
        JScrollPane sc = new JScrollPane(table);
        getContentPane().add(sc, BorderLayout.CENTER);
        buttonInit();//调用按钮，按钮初始化
        addMyListener();//组件的监听事件
    }
    private void buttonInit() {
        final JPanel panel = new JPanel();//内部默认流布局
        getContentPane().add(panel, BorderLayout.SOUTH);
        panel.add(new JLabel("A:"));
        aTextField = new JTextField("A4", 5);//文本框的内容和宽度
        panel.add(aTextField);
        panel.add(new Label("B:"));
        bTextField = new JTextField("B4", 5);
        panel.add(bTextField);
        addButton = new JButton("增加");
        delButton = new JButton("删除");
        updButton = new JButton("修改");
        panel.add(addButton);
        panel.add(delButton);
        panel.add(updButton);
    }
    private void addMyListener() {
        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String rowData[] = {aTextField.getText(), bTextField.getText()};
                model.addRow(rowData);//在表格模型中增加一行内容(文本框内容)
                int rowCount = table.getRowCount() + 1;//获取当前行数+1
                aTextField.setText("A" + rowCount);//文本框中内容增1
                bTextField.setText("B" + rowCount);
            }
        });
        updButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedRow = table.getSelectedRow();//获取被选中行的索引
                if (selectedRow != -1) {//存在被选中行
                    model.setValueAt(aTextField.getText(), selectedRow, 0);//修改第1列的值
                    model.setValueAt(bTextField.getText(), selectedRow, 1);//修改第2列的值
                }
            }
        });
        delButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int selectedRow = table.getSelectedRow();
                if (selectedRow != -1) {
                    model.removeRow(selectedRow);//删除选中的行
                }
            }
        });
    }
    public static void main(String[] args) {
        Demo frame = new Demo();
        frame.setVisible(true);
    }
}