请直接给出java代码

好的，以下是一个简单的Java代码示例，可以实现您所描述的功能：

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

public class StackGUI extends JFrame {
    private JPanel contentPane;
    private JPanel stackPanel;
    private JLabel topLabel;
    private int topIndex = -1;
    private int[] stack = new int[10];

    public StackGUI() {
        setTitle("Stack GUI");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 300, 300);
        contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout());
        setContentPane(contentPane);

        stackPanel = new JPanel();
        stackPanel.setLayout(new GridLayout(10, 1));
        for (int i = 0; i < 10; i++) {
            JPanel panel = new JPanel();
            panel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
            JLabel label = new JLabel(String.valueOf(i));
            panel.add(label);
            stackPanel.add(panel);
        }
        contentPane.add(stackPanel, BorderLayout.CENTER);

        JPanel topPanel = new JPanel();
        topLabel = new JLabel("TOP -->");
        topPanel.add(topLabel);
        contentPane.add(topPanel, BorderLayout.SOUTH);

        JButton pushButton = new JButton("Push");
        pushButton.addActionListener(e -> push());
        contentPane.add(pushButton, BorderLayout.NORTH);
    }

    private void push() {
        if (topIndex < 9) {
            topIndex++;
            stack[topIndex] = topIndex + 1;
            JPanel panel = (JPanel) stackPanel.getComponent(topIndex);
            panel.removeAll();
            JLabel label = new JLabel(String.valueOf(stack[topIndex]));
            panel.add(label);
            topLabel.setText("TOP --> " + stack[topIndex]);
        } else {
            JOptionPane.showMessageDialog(this, "Stack is full!");
        }
    }

    public static void main(String[] args) {
        StackGUI gui = new StackGUI();
        gui.setVisible(true);
    }
}

这段代码创建了一个简单的堆栈GUI，可以在界面中显示堆栈的每个单元的边框并标上序号，并添加了一个指针样式的TOP，以指向当前栈顶元素。当用户点击“Push”按钮时，程序将在堆栈中添加一个新元素，并在界面中更新堆栈元素和TOP指针。这个例子可以帮助您更好地理解如何使用Java和Swing库来创建堆栈GUI。