使用GridBagLayout创建跨多行的组件

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

public class GridBagLayoutExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("GridBagLayout Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        GridBagLayout layout = new GridBagLayout();
        panel.setLayout(layout);

        GridBagConstraints constraints = new GridBagConstraints();
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;
        constraints.fill = GridBagConstraints.BOTH;
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;

        JLabel label1 = new JLabel("Label 1");
        layout.setConstraints(label1, constraints);
        panel.add(label1);

        constraints.gridx = 1;
        constraints.gridy = 0;
        constraints.gridwidth = 1;
        constraints.gridheight = 2;

        JTextArea textArea = new JTextArea();
        layout.setConstraints(textArea, constraints);
        panel.add(textArea);

        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.gridwidth = 1;
        constraints.gridheight = 1;

        JLabel label2 = new JLabel("Label 2");
        layout.setConstraints(label2, constraints);
        panel.add(label2);

        frame.add(panel);
        frame.pack();
        frame.setVisible(true);
    }
}