请用Java写符合以下要求的代码，并用中文回答 Write a simple GUI program with a button that responds to events from a mouse being pressed and released. The button should display: • the message “No action” when no action is taken on the mouse. • the message “Pressing down” when the mouse is pressed.

以下是一个简单的Java GUI程序，包含一个按钮和一个标签。当鼠标按下按钮时，标签将显示“Pressing down”，当鼠标释放按钮时，标签将显示“No action”。

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

public class MouseButtonGUI extends JFrame implements MouseListener {
    private JButton button;
    private JLabel label;

    public MouseButtonGUI() {
        setTitle("Mouse Button GUI");
        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        button = new JButton("Click me!");
        button.addMouseListener(this);

        label = new JLabel("No action");

        JPanel panel = new JPanel();
        panel.add(button);
        panel.add(label);

        add(panel);
        setVisible(true);
    }

    public static void main(String[] args) {
        new MouseButtonGUI();
    }

    @Override
    public void mouseClicked(MouseEvent e) {
    }

    @Override
    public void mousePressed(MouseEvent e) {
        label.setText("Pressing down");
    }

    @Override
    public void mouseReleased(MouseEvent e) {
        label.setText("No action");
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }
}