简易计算器模拟程序java 功能要求：该程序显示GUI用户界面，能实现整数的加、减、乘、除运算。java

好的，我可以帮您实现一个简易计算器模拟程序的Java代码。以下是示例代码：

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

public class Calculator extends JFrame implements ActionListener {
    private JTextField tf1, tf2, tf3;
    private JButton add, subtract, multiply, divide;

    public Calculator() {
        setTitle("Calculator");
        setSize(300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(4, 2));

        tf1 = new JTextField(10);
        tf2 = new JTextField(10);
        tf3 = new JTextField(10);
        add = new JButton("+");
        subtract = new JButton("-");
        multiply = new JButton("*");
        divide = new JButton("/");

        add.addActionListener(this);
        subtract.addActionListener(this);
        multiply.addActionListener(this);
        divide.addActionListener(this);

        add(new JLabel("Number 1: "));
        add(tf1);
        add(new JLabel("Number 2: "));
        add(tf2);
        add(new JLabel("Result: "));
        add(tf3);
        add(add);
        add(subtract);
        add(multiply);
        add(divide);

        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        int num1 = Integer.parseInt(tf1.getText());
        int num2 = Integer.parseInt(tf2.getText());
        int result = 0;

        if (e.getSource() == add) {
            result = num1 + num2;
        } else if (e.getSource() == subtract) {
            result = num1 - num2;
        } else if (e.getSource() == multiply) {
            result = num1 * num2;
        } else if (e.getSource() == divide) {
            result = num1 / num2;
        }

        tf3.setText(result + "");
    }

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

这段代码会创建一个GUI用户界面，包含两个文本框和四个按钮，分别对应加、减、乘、除运算。当用户点击这些按钮时，程序会根据用户输入的两个整数进行相应的运算，并将结果显示在第三个文本框中。