用java做一个GUI计算器，能实现加减乘除，但是除法如果除数为0会窗口跳出异常

好的，以下是用 Java 编写的一个简单的 GUI 计算器，可以实现加减乘除的功能。如果除数为 0，会弹出一个对话框提示用户输入错误。

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField textField;
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
    private JButton buttonAdd, buttonSubtract, buttonMultiply, buttonDivide, buttonEqual, buttonClear;

    private double num1 = 0, num2 = 0, result = 0;
    private String operator = "";

    public Calculator() {
        setTitle("Calculator");
        setSize(300, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        textField = new JTextField(10);
        textField.setEditable(false);
        textField.setHorizontalAlignment(JTextField.RIGHT);

        button0 = new JButton("0");
        button1 = new JButton("1");
        button2 = new JButton("2");
        button3 = new JButton("3");
        button4 = new JButton("4");
        button5 = new JButton("5");
        button6 = new JButton("6");
        button7 = new JButton("7");
        button8 = new JButton("8");
        button9 = new JButton("9");

        buttonAdd = new JButton("+");
        buttonSubtract = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");
        buttonEqual = new JButton("=");
        buttonClear = new JButton("C");

        button0.addActionListener(this);
        button1.addActionListener(this);
        button2.addActionListener(this);
        button3.addActionListener(this);
        button4.addActionListener(this);
        button5.addActionListener(this);
        button6.addActionListener(this);
        button7.addActionListener(this);
        button8.addActionListener(this);
        button9.addActionListener(this);

        buttonAdd.addActionListener(this);
        buttonSubtract.addActionListener(this);
        buttonMultiply.addActionListener(this);
        buttonDivide.addActionListener(this);
        buttonEqual.addActionListener(this);
        buttonClear.addActionListener(this);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 4));
        buttonPanel.add(button7);
        buttonPanel.add(button8);
        buttonPanel.add(button9);
        buttonPanel.add(buttonDivide);
        buttonPanel.add(button4);
        buttonPanel.add(button5);
        buttonPanel.add(button6);
        buttonPanel.add(buttonMultiply);
        buttonPanel.add(button1);
        buttonPanel.add(button2);
        buttonPanel.add(button3);
        buttonPanel.add(buttonSubtract);
        buttonPanel.add(button0);
        buttonPanel.add(buttonEqual);
        buttonPanel.add(buttonClear);
        buttonPanel.add(buttonAdd);

        setLayout(new BorderLayout());
        add(textField, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.CENTER);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String buttonText = e.getActionCommand();
        if (buttonText.equals("C")) {
            textField.setText("");
            num1 = 0;
            num2 = 0;
            result = 0;
            operator = "";
        } else if (buttonText.equals("+")) {
            num1 = Double.parseDouble(textField.getText());
            operator = "+";
            textField.setText("");
        } else if (buttonText.equals("-")) {
            num1 = Double.parseDouble(textField.getText());
            operator = "-";
            textField.setText("");
        } else if (buttonText.equals("*")) {
            num1 = Double.parseDouble(textField.getText());
            operator = "*";
            textField.setText("");
        } else if (buttonText.equals("/")) {
            num1 = Double.parseDouble(textField.getText());
            operator = "/";
            textField.setText("");
        } else if (buttonText.equals("=")) {
            num2 = Double.parseDouble(textField.getText());
            if (operator.equals("+")) {
                result = num1 + num2;
            } else if (operator.equals("-")) {
                result = num1 - num2;
            } else if (operator.equals("*")) {
                result = num1 * num2;
            } else if (operator.equals("/")) {
                if (num2 == 0) {
                    JOptionPane.showMessageDialog(null, "除数不能为0", "错误", JOptionPane.ERROR_MESSAGE);
                    textField.setText("");
                    return;
                } else {
                    result = num1 / num2;
                }
            }
            textField.setText("" + result);
        } else {
            textField.setText(textField.getText() + buttonText);
        }
    }

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

这个计算器采用了 Java 的 Swing 框架来实现 GUI，使用了 GridLayout 来布局按钮。当用户点击操作符按钮时，记录下当前的数字和操作符，当用户点击等号按钮时，根据当前的操作符计算结果并显示在文本框中。当用户点击清除按钮时，清空文本框和记录的数字和操作符。当用户点击除法操作符并且除数为 0 时，会弹出一个对话框提示用户输入错误。