java简易计算器图形化结构图

我很抱歉，作为一名语言模型AI，我无法绘制图形化结构图。但我可以给你提供一个简单的Java计算器程序的代码，你可以根据代码自己尝试绘制结构图。

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

public class Calculator extends JFrame implements ActionListener {
    private JPanel panel;
    private JTextField display;
    private JButton[] buttons;
    private String[] labels = { "Backspace", "", "", "CE", "C", "7", "8", "9", "/", "sqrt", "4", "5", "6", "*", "%", "1",
            "2", "3", "-", "1/x", "0", "+/-", ".", "+", "=", };
    private double result = 0;
    private String operator = "=";
    private boolean startOfNumber = true;

    public Calculator() {
        display = new JTextField(35);
        panel = new JPanel();
        display.setText("0.0");
        panel.setLayout(new GridLayout(0, 5, 3, 3));
        buttons = new JButton[25];
        int index = 0;
        for (int rows = 0; rows < 5; rows++) {
            for (int cols = 0; cols < 5; cols++) {
                buttons[index] = new JButton(labels[index]);
                if (cols >= 3)
                    buttons[index].setForeground(Color.red);
                else
                    buttons[index].setForeground(Color.blue);
                buttons[index].setBackground(Color.yellow);
                panel.add(buttons[index]);
                buttons[index].addActionListener(this);
                index++;
            }
        }
        add(display, BorderLayout.NORTH);
        add(panel, BorderLayout.CENTER);
        setVisible(true);
        pack();
    }

    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        if (command.charAt(0) == 'C') {
            startOfNumber = true;
            result = 0;
            operator = "=";
            display.setText("0.0");
        } else if (command.charAt(0) >= '0' && command.charAt(0) <= '9' || command.equals(".")) {
            if (startOfNumber == true)
                display.setText(command);
            else
                display.setText(display.getText() + command);
            startOfNumber = false;
        } else {
            if (startOfNumber) {
                if (command.equals("-")) {
                    display.setText(command);
                    startOfNumber = false;
                } else
                    operator = command;
            } else {
                double x = Double.parseDouble(display.getText());
                arithmetic(x);
                operator = command;
                startOfNumber = true;
            }
        }
    }

    public void arithmetic(double y) {
        if (operator.equals("+"))
            result += y;
        else if (operator.equals("-"))
            result -= y;
        else if (operator.equals("*"))
            result *= y;
        else if (operator.equals("/"))
            result /= y;
        else if (operator.equals("sqrt"))
            result = Math.sqrt(y);
        else if (operator.equals("%"))
            result %= y;
        else if (operator.equals("="))
            result = y;
        else if (operator.equals("1/x"))
            result = 1 / y;
        display.setText("" + result);
    }

    public static void main(String[] args) {
        Calculator calculator = new Calculator();
    }
}