用Java写一个基于MVVM的中英文单词计算器

好的，我会尽力回答您的问题。首先，让我们来了解一下MVVM模式是什么。

MVVM是Model-View-ViewModel的缩写，是一种软件架构模式，它将应用程序分为三个部分：模型（数据和业务逻辑）、视图（用户界面）和视图模型（连接模型和视图的中间件）。

下面是一个基于MVVM的中英文单词计算器的Java代码示例：

Model类：

public class CalculatorModel {

    private float operand1;
    private float operand2;
    private float result;

    public void setOperand1(float operand1) {
        this.operand1 = operand1;
    }

    public void setOperand2(float operand2) {
        this.operand2 = operand2;
    }

    public float getResult() {
        return result;
    }

    public void add() {
        result = operand1 + operand2;
    }

    public void subtract() {
        result = operand1 - operand2;
    }

    public void multiply() {
        result = operand1 * operand2;
    }

    public void divide() {
        if (operand2 == 0) {
            result = Float.NaN;
        } else {
            result = operand1 / operand2;
        }
    }
}

ViewModel类：

public class CalculatorViewModel {

    private CalculatorModel model;
    private String operand1;
    private String operand2;
    private String result;

    public CalculatorViewModel() {
        model = new CalculatorModel();
    }

    public void setOperand1(String operand1) {
        this.operand1 = operand1;
    }

    public void setOperand2(String operand2) {
        this.operand2 = operand2;
    }

    public String getResult() {
        return result;
    }

    public void add() {
        model.setOperand1(Float.parseFloat(operand1));
        model.setOperand2(Float.parseFloat(operand2));
        model.add();
        result = Float.toString(model.getResult());
    }

    public void subtract() {
        model.setOperand1(Float.parseFloat(operand1));
        model.setOperand2(Float.parseFloat(operand2));
        model.subtract();
        result = Float.toString(model.getResult());
    }

    public void multiply() {
        model.setOperand1(Float.parseFloat(operand1));
        model.setOperand2(Float.parseFloat(operand2));
        model.multiply();
        result = Float.toString(model.getResult());
    }

    public void divide() {
        model.setOperand1(Float.parseFloat(operand1));
        model.setOperand2(Float.parseFloat(operand2));
        model.divide();
        result = Float.toString(model.getResult());
    }
}

View类：

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

public class CalculatorView extends JFrame {

    private CalculatorViewModel viewModel;
    private JTextField operand1TextField;
    private JTextField operand2TextField;
    private JTextField resultTextField;
    private JButton addButton;
    private JButton subtractButton;
    private JButton multiplyButton;
    private JButton divideButton;

    public CalculatorView() {
        viewModel = new CalculatorViewModel();

        operand1TextField = new JTextField(10);
        operand2TextField = new JTextField(10);
        resultTextField = new JTextField(10);
        resultTextField.setEditable(false);

        addButton = new JButton("+");
        subtractButton = new JButton("-");
        multiplyButton = new JButton("*");
        divideButton = new JButton("/");

        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                viewModel.setOperand1(operand1TextField.getText());
                viewModel.setOperand2(operand2TextField.getText());
                viewModel.add();
                resultTextField.setText(viewModel.getResult());
            }
        });

        subtractButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                viewModel.setOperand1(operand1TextField.getText());
                viewModel.setOperand2(operand2TextField.getText());
                viewModel.subtract();
                resultTextField.setText(viewModel.getResult());
            }
        });

        multiplyButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                viewModel.setOperand1(operand1TextField.getText());
                viewModel.setOperand2(operand2TextField.getText());
                viewModel.multiply();
                resultTextField.setText(viewModel.getResult());
            }
        });

        divideButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                viewModel.setOperand1(operand1TextField.getText());
                viewModel.setOperand2(operand2TextField.getText());
                viewModel.divide();
                resultTextField.setText(viewModel.getResult());
            }
        });

        JPanel panel = new JPanel(new GridLayout(4, 2));
        panel.add(new JLabel("Operand 1:"));
        panel.add(operand1TextField);
        panel.add(new JLabel("Operand 2:"));
        panel.add(operand2TextField);
        panel.add(new JLabel("Result:"));
        panel.add(resultTextField);
        panel.add(addButton);
        panel.add(subtractButton);
        panel.add(multiplyButton);
        panel.add(divideButton);

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("Calculator");
        this.setContentPane(panel);
        this.pack();
    }

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

这个计算器可以进行加、减、乘、除四种运算，视图中包含两个文本框和四个按钮，点击按钮后，视图模型会将文本框中的内容转换为浮点数，并调用计算器模型中相应的方法进行计算，最后将结果显示在结果文本框中。

希望这个代码示例对您有所帮助！