java简易计算器界面设计

以下是一个简易计算器的Java界面设计示例：

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

public class CalculatorGUI extends JFrame {
    private JTextField displayField;
    private JButton[] numberButtons;
    private JButton[] operatorButtons;
    private JButton equalsButton;
    private JButton clearButton;

    public CalculatorGUI() {
        setTitle("简易计算器");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setResizable(false);

        displayField = new JTextField();
        displayField.setEditable(false);
        displayField.setHorizontalAlignment(JTextField.RIGHT);

        numberButtons = new JButton[10];
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
        }

        operatorButtons = new JButton[4];
        operatorButtons[0] = new JButton("+");
        operatorButtons[1] = new JButton("-");
        operatorButtons[2] = new JButton("*");
        operatorButtons[3] = new JButton("/");

        equalsButton = new JButton("=");
        clearButton = new JButton("CE");

        JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
        buttonPanel.add(numberButtons[7]);
        buttonPanel.add(numberButtons[8]);
        buttonPanel.add(numberButtons[9]);
        buttonPanel.add(operatorButtons[0]);
        buttonPanel.add(numberButtons[4]);
        buttonPanel.add(numberButtons[5]);
        buttonPanel.add(numberButtons[6]);
        buttonPanel.add(operatorButtons[1]);
        buttonPanel.add(numberButtons[1]);
        buttonPanel.add(numberButtons[2]);
        buttonPanel.add(numberButtons[3]);
        buttonPanel.add(operatorButtons[2]);
        buttonPanel.add(numberButtons[0]);
        buttonPanel.add(clearButton);
        buttonPanel.add(equalsButton);
        buttonPanel.add(operatorButtons[3]);

        setLayout(new BorderLayout());
        add(displayField, BorderLayout.NORTH);
        add(buttonPanel, BorderLayout.CENTER);

        pack();
        setLocationRelativeTo(null);

        // 添加事件监听器
        for (int i = 0; i < 10; i++) {
            final int num = i;
            numberButtons[i].addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    displayField.setText(displayField.getText() + num);
                }
            });
        }

        for (int i = 0; i < 4; i++) {
            final String operator = operatorButtons[i].getText();
            operatorButtons[i].addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    displayField.setText(displayField.getText() + " " + operator + " ");
                }
            });
        }

        equalsButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String expression = displayField.getText();
                String[] parts = expression.split(" ");
                double result = Double.parseDouble(parts[0]);
                for (int i = 1; i < parts.length; i += 2) {
                    String operator = parts[i];
                    double operand = Double.parseDouble(parts[i + 1]);
                    switch (operator) {
                        case "+":
                            result += operand;
                            break;
                        case "-":
                            result -= operand;
                            break;
                        case "*":
                            result *= operand;
                            break;
                        case "/":
                            result /= operand;
                            break;
                    }
                }
                displayField.setText(String.valueOf(result));
            }
        });

        clearButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                displayField.setText("");
            }
        });
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new CalculatorGUI().setVisible(true);
            }
        });
    }
}