用java制作一个简易计算器。比如：按键得到23*2.2 单机“=”得出结果50.6 。“MC键实现清 除右侧的显示内容。 简易计算器用图形显示出

好的，我可以为您提供一个Java Swing GUI实现的简易计算器。下面是代码示例：

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

public class Calculator {
    private JFrame frame;
    private JTextField textField;

    private double num1 = 0.0;
    private double num2 = 0.0;
    private String operator = "";

    public Calculator() {
        frame = new JFrame("简易计算器");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 400);
        frame.setLayout(new BorderLayout());

        // 显示结果的文本框
        textField = new JTextField();
        textField.setEditable(false);
        textField.setHorizontalAlignment(JTextField.RIGHT);
        frame.add(textField, BorderLayout.NORTH);

        // 数字和运算符按钮面板
        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 4));

        // 数字按钮
        for (int i = 1; i <= 9; i++) {
            JButton button = new JButton(String.valueOf(i));
            button.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    String text = textField.getText() + button.getText();
                    textField.setText(text);
                }
            });
            buttonPanel.add(button);
        }

        // 清除按钮
        JButton clearButton = new JButton("C");
        clearButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                textField.setText("");
                num1 = 0.0;
                num2 = 0.0;
                operator = "";
            }
        });
        buttonPanel.add(clearButton);

        // 零按钮
        JButton zeroButton = new JButton("0");
        zeroButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String text = textField.getText() + zeroButton.getText();
                textField.setText(text);
            }
        });
        buttonPanel.add(zeroButton);

        // 小数点按钮
        JButton dotButton = new JButton(".");
        dotButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String text = textField.getText() + dotButton.getText();
                textField.setText(text);
            }
        });
        buttonPanel.add(dotButton);

        // 加按钮
        JButton addButton = new JButton("+");
        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                num1 = Double.parseDouble(textField.getText());
                operator = "+";
                textField.setText("");
            }
        });
        buttonPanel.add(addButton);

        // 减按钮
        JButton subtractButton = new JButton("-");
        subtractButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                num1 = Double.parseDouble(textField.getText());
                operator = "-";
                textField.setText("");
            }
        });
        buttonPanel.add(subtractButton);

        // 乘按钮
        JButton multiplyButton = new JButton("*");
        multiplyButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                num1 = Double.parseDouble(textField.getText());
                operator = "*";
                textField.setText("");
            }
        });
        buttonPanel.add(multiplyButton);

        // 除按钮
        JButton divideButton = new JButton("/");
        divideButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                num1 = Double.parseDouble(textField.getText());
                operator = "/";
                textField.setText("");
            }
        });
        buttonPanel.add(divideButton);

        frame.add(buttonPanel, BorderLayout.CENTER);

        // 等号按钮
        JButton equalsButton = new JButton("=");
        equalsButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                num2 = Double.parseDouble(textField.getText());
                double result = 0.0;
                switch (operator) {
                    case "+":
                        result = num1 + num2;
                        break;
                    case "-":
                        result = num1 - num2;
                        break;
                    case "*":
                        result = num1 * num2;
                        break;
                    case "/":
                        result = num1 / num2;
                        break;
                }
                textField.setText(String.valueOf(result));
            }
        });
        frame.add(equalsButton, BorderLayout.SOUTH);

        frame.setVisible(true);
    }

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

运行这段代码，将会得到一个简易计算器的GUI界面。您可以通过数字按钮输入数字，通过加、减、乘、除按钮输入运算符，然后按下等号按钮计算结果。

如果您想要在这个示例中添加MC键来清除右侧的显示内容，可以在数字和运算符按钮面板中添加一个MC按钮，然后为它添加一个ActionListener来清除文本框的内容。