java实现加减乘除_用Java编写实现加减乘除，界面如下

我可以给你提供一个简单的Java实现，包括一个基本的界面和加减乘除的计算功能。你可以根据自己的需求修改和扩展它。

代码如下：

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

public class Calculator implements ActionListener {
    private JFrame frame;
    private JTextField textField;
    private JButton addButton, subtractButton, multiplyButton, divideButton, clearButton, equalsButton;
    private double firstNumber, secondNumber, result;
    private String operator;

    public Calculator() {
        // 创建界面
        frame = new JFrame("简单计算器");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 300);

        // 创建文本框
        textField = new JTextField();
        textField.setEditable(false);
        textField.setHorizontalAlignment(SwingConstants.RIGHT);

        // 创建按钮
        addButton = new JButton("+");
        subtractButton = new JButton("-");
        multiplyButton = new JButton("*");
        divideButton = new JButton("/");
        clearButton = new JButton("C");
        equalsButton = new JButton("=");

        // 添加按钮监听器
        addButton.addActionListener(this);
        subtractButton.addActionListener(this);
        multiplyButton.addActionListener(this);
        divideButton.addActionListener(this);
        clearButton.addActionListener(this);
        equalsButton.addActionListener(this);

        // 创建面板
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(4, 4));
        panel.add(addButton);
        panel.add(subtractButton);
        panel.add(multiplyButton);
        panel.add(divideButton);
        panel.add(new JButton("7"));
        panel.add(new JButton("8"));
        panel.add(new JButton("9"));
        panel.add(new JButton("4"));
        panel.add(new JButton("5"));
        panel.add(new JButton("6"));
        panel.add(new JButton("1"));
        panel.add(new JButton("2"));
        panel.add(new JButton("3"));
        panel.add(clearButton);
        panel.add(new JButton("0"));
        panel.add(equalsButton);

        // 添加组件到窗口
        frame.getContentPane().add(textField, BorderLayout.NORTH);
        frame.getContentPane().add(panel, BorderLayout.CENTER);

        // 显示窗口
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent event) {
        String command = event.getActionCommand();
        if (command.equals("C")) {
            // 清空文本框和操作数
            textField.setText("");
            firstNumber = 0;
            secondNumber = 0;
            result = 0;
            operator = "";
        } else if (command.equals("+") || command.equals("-") || command.equals("*") || command.equals("/")) {
            // 记录第一个操作数和操作符
            firstNumber = Double.parseDouble(textField.getText());
            operator = command;
            textField.setText("");
        } else if (command.equals("=")) {
            // 计算结果
            secondNumber = Double.parseDouble(textField.getText());
            if (operator.equals("+")) {
                result = firstNumber + secondNumber;
            } else if (operator.equals("-")) {
                result = firstNumber - secondNumber;
            } else if (operator.equals("*")) {
                result = firstNumber * secondNumber;
            } else if (operator.equals("/")) {
                result = firstNumber / secondNumber;
            }
            textField.setText("" + result);
        } else {
            // 添加数字到文本框
            textField.setText(textField.getText() + command);
        }
    }

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

这个程序使用了Java Swing库来创建界面和组件，实现了加减乘除的计算功能。你可以根据自己的需求修改和扩展它。