扩展JTable大小以填充JPanel

import javax.swing.*;
import java.awt.*;

public class TablePanel extends JPanel {
    private JTable table;

    public TablePanel() {
        // 创建JTable对象
        table = new JTable();

        // 设置JTable的布局管理器为自由布局
        table.setLayout(null);

        // 获取JPanel的宽度和高度
        int panelWidth = getWidth();
        int panelHeight = getHeight();

        // 设置JTable的大小为JPanel的宽度和高度
        table.setSize(panelWidth, panelHeight);

        // 将JTable添加到JPanel中
        add(table);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        // 获取JPanel的宽度和高度
        int panelWidth = getWidth();
        int panelHeight = getHeight();

        // 设置JTable的大小为JPanel的宽度和高度
        table.setSize(panelWidth, panelHeight);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 300);

        TablePanel tablePanel = new TablePanel();
        frame.add(tablePanel);

        frame.setVisible(true);
    }
}