计算器界面Java代码

以下是一个简单的计算器界面Java代码：

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

public class CalculatorGUI extends JFrame implements ActionListener {
    private JPanel mainPanel;
    private JTextField inputField;
    private JButton button0;
    private JButton button1;
    private JButton button2;
    private JButton button3;
    private JButton button4;
    private JButton button5;
    private JButton button6;
    private JButton button7;
    private JButton button8;
    private JButton button9;
    private JButton buttonAdd;
    private JButton buttonSubtract;
    private JButton buttonMultiply;
    private JButton buttonDivide;
    private JButton buttonEquals;
    private JButton buttonClear;

    private double currentNumber;
    private String currentOperator;
    private boolean isNewNumber;

    public CalculatorGUI() {
        setTitle("Calculator");
        setSize(300, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);

        mainPanel = new JPanel(new BorderLayout());
        inputField = new JTextField();
        inputField.setHorizontalAlignment(JTextField.RIGHT);
        inputField.setPreferredSize(new Dimension(300, 50));

        JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
        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");
        buttonAdd = new JButton("+");
        buttonSubtract = new JButton("-");
        buttonMultiply = new JButton("*");
        buttonDivide = new JButton("/");
        buttonEquals = new JButton("=");
        buttonClear = new JButton("C");

        buttonPanel.add(button7);
        buttonPanel.add(button8);
        buttonPanel.add(button9);
        buttonPanel.add(buttonAdd);
        buttonPanel.add(button4);
        buttonPanel.add(button5);
        buttonPanel.add(button6);
        buttonPanel.add(buttonSubtract);
        buttonPanel.add(button1);
        buttonPanel.add(button2);
        buttonPanel.add(button3);
        buttonPanel.add(buttonMultiply);
        buttonPanel.add(buttonClear);
        buttonPanel.add(button0);
        buttonPanel.add(buttonEquals);
        buttonPanel.add(buttonDivide);

        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);
        buttonEquals.addActionListener(this);
        buttonClear.addActionListener(this);

        currentNumber = 0;
        currentOperator = "";
        isNewNumber = true;

        mainPanel.add(inputField, BorderLayout.NORTH);
        mainPanel.add(buttonPanel, BorderLayout.CENTER);

        setContentPane(mainPanel);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String buttonLabel = e.getActionCommand();
        if (buttonLabel.equals("C")) {
            inputField.setText("");
            currentNumber = 0;
            currentOperator = "";
            isNewNumber = true;
        } else if (buttonLabel.equals("=")) {
            double result = 0;
            if (currentOperator.equals("+")) {
                result = currentNumber + Double.parseDouble(inputField.getText());
            } else if (currentOperator.equals("-")) {
                result = currentNumber - Double.parseDouble(inputField.getText());
            } else if (currentOperator.equals("*")) {
                result = currentNumber * Double.parseDouble(inputField.getText());
            } else if (currentOperator.equals("/")) {
                result = currentNumber / Double.parseDouble(inputField.getText());
            }
            inputField.setText(String.valueOf(result));
            currentNumber = result;
            currentOperator = "";
            isNewNumber = true;
        } else if (buttonLabel.equals("+")) {
            currentNumber = Double.parseDouble(inputField.getText());
            currentOperator = "+";
            isNewNumber = true;
        } else if (buttonLabel.equals("-")) {
            currentNumber = Double.parseDouble(inputField.getText());
            currentOperator = "-";
            isNewNumber = true;
        } else if (buttonLabel.equals("*")) {
            currentNumber = Double.parseDouble(inputField.getText());
            currentOperator = "*";
            isNewNumber = true;
        } else if (buttonLabel.equals("/")) {
            currentNumber = Double.parseDouble(inputField.getText());
            currentOperator = "/";
            isNewNumber = true;
        } else {
            if (isNewNumber) {
                inputField.setText(buttonLabel);
                isNewNumber = false;
            } else {
                inputField.setText(inputField.getText() + buttonLabel);
            }
        }
    }

    public static void main(String[] args) {
        new CalculatorGUI();
    }
}

上述代码使用Java Swing GUI库创建了一个简单的计算器界面，并实现了基本的计算功能。用户可以通过按钮输入数字和运算符，计算器会在文本框中显示计算结果。界面还包括一个清除按钮，可以清除当前的计算结果。