Java gui计算器实现加减乘除和求余等功能

以下是一个简单的Java GUI计算器实现加减乘除和求余等功能的示例代码：

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

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, buttonModulus, buttonEqual, buttonClear;
    private double num1, num2, result;
    private String operator;

    public Calculator() {
        super("Calculator");

        // Create text field
        textField = new JTextField(20);
        textField.setEditable(false);

        // Create number buttons
        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");

        // Create operator buttons
        buttonAdd = new JButton("+");
        buttonSubtract = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");
        buttonModulus = new JButton("%");
        buttonEqual = new JButton("=");
        buttonClear = new JButton("C");

        // Add action listeners to buttons
        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);
        buttonModulus.addActionListener(this);
        buttonEqual.addActionListener(this);
        buttonClear.addActionListener(this);

        // Create number panel and add buttons
        JPanel numberPanel = new JPanel(new GridLayout(4, 3));
        numberPanel.add(button1);
        numberPanel.add(button2);
        numberPanel.add(button3);
        numberPanel.add(button4);
        numberPanel.add(button5);
        numberPanel.add(button6);
        numberPanel.add(button7);
        numberPanel.add(button8);
        numberPanel.add(button9);
        numberPanel.add(buttonClear);
        numberPanel.add(button0);
        numberPanel.add(buttonEqual);

        // Create operator panel and add buttons
        JPanel operatorPanel = new JPanel(new GridLayout(3, 2));
        operatorPanel.add(buttonAdd);
        operatorPanel.add(buttonSubtract);
        operatorPanel.add(buttonMultiply);
        operatorPanel.add(buttonDivide);
        operatorPanel.add(buttonModulus);

        // Create content pane and add text field and panels
        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(textField, BorderLayout.NORTH);
        contentPane.add(numberPanel, BorderLayout.CENTER);
        contentPane.add(operatorPanel, BorderLayout.EAST);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button0) {
            textField.setText(textField.getText() + "0");
        } else if (e.getSource() == button1) {
            textField.setText(textField.getText() + "1");
        } else if (e.getSource() == button2) {
            textField.setText(textField.getText() + "2");
        } else if (e.getSource() == button3) {
            textField.setText(textField.getText() + "3");
        } else if (e.getSource() == button4) {
            textField.setText(textField.getText() + "4");
        } else if (e.getSource() == button5) {
            textField.setText(textField.getText() + "5");
        } else if (e.getSource() == button6) {
            textField.setText(textField.getText() + "6");
        } else if (e.getSource() == button7) {
            textField.setText(textField.getText() + "7");
        } else if (e.getSource() == button8) {
            textField.setText(textField.getText() + "8");
        } else if (e.getSource() == button9) {
            textField.setText(textField.getText() + "9");
        } else if (e.getSource() == buttonAdd) {
            num1 = Double.parseDouble(textField.getText());
            operator = "+";
            textField.setText("");
        } else if (e.getSource() == buttonSubtract) {
            num1 = Double.parseDouble(textField.getText());
            operator = "-";
            textField.setText("");
        } else if (e.getSource() == buttonMultiply) {
            num1 = Double.parseDouble(textField.getText());
            operator = "*";
            textField.setText("");
        } else if (e.getSource() == buttonDivide) {
            num1 = Double.parseDouble(textField.getText());
            operator = "/";
            textField.setText("");
        } else if (e.getSource() == buttonModulus) {
            num1 = Double.parseDouble(textField.getText());
            operator = "%";
            textField.setText("");
        } else if (e.getSource() == buttonEqual) {
            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("/")) {
                result = num1 / num2;
            } else if (operator.equals("%")) {
                result = num1 % num2;
            }
            textField.setText(String.valueOf(result));
        } else if (e.getSource() == buttonClear) {
            textField.setText("");
        }
    }

    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        calculator.pack();
        calculator.setLocationRelativeTo(null);
        calculator.setVisible(true);
    }
}

这个程序使用了Java的Swing GUI工具包来创建用户界面，并使用了ActionListener接口来处理按钮事件。当用户点击数字和运算符按钮时，它们的文本将添加到文本字段中。当用户点击等号按钮时，程序将解析文本字段中的数字并执行所选操作，并将结果显示在文本字段中。当用户点击清除按钮时，文本字段将被清空。