用户窗口界面将三个按钮用GridBagLayout方法纵向排列java代码

好的，下面是Java代码实现：

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class VerticalButtonLayout {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Vertical Button Layout");
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = GridBagConstraints.RELATIVE;
        gbc.fill = GridBagConstraints.VERTICAL;
        gbc.weighty = 1.0;

        JButton button1 = new JButton("Button 1");
        panel.add(button1, gbc);

        JButton button2 = new JButton("Button 2");
        panel.add(button2, gbc);

        JButton button3 = new JButton("Button 3");
        panel.add(button3, gbc);

        frame.getContentPane().add(panel);
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
}

这段代码将三个按钮使用GridBagLayout方法纵向排列，其中GridBagConstraints对象指定了按钮在容器中的位置和大小。