用java写一个计算器，要求有用户使用界面，实现进制转换操作，有清除键和归零键，有异常处理

以下是一个简单的 Java 计算器示例，包括进制转换、清除键、归零键和异常处理。

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

public class Calculator extends JFrame implements ActionListener {

    private JTextField inputField; // 输入框
    private JButton[] numberButtons; // 数字键
    private JButton[] operatorButtons; // 操作符键
    private JButton clearButton; // 清除键
    private JButton resetButton; // 归零键
    private JButton hexButton; // 十六进制转换键
    private JButton binButton; // 二进制转换键
    private JButton decButton; // 十进制转换键
    private int currentOperator; // 当前操作符
    private double result; // 计算结果
    private int base; // 当前进制

    public Calculator() {
        setTitle("Calculator");
        setSize(300, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        inputField = new JTextField(20);
        add(inputField, BorderLayout.NORTH);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(5, 4));

        String[] numberLabels = {"7", "8", "9", "4", "5", "6", "1", "2", "3", "0", ".", "+/-", "(", ")", "/", "*", "-", "+"};
        numberButtons = new JButton[numberLabels.length];
        for (int i = 0; i < numberLabels.length; i++) {
            numberButtons[i] = new JButton(numberLabels[i]);
            numberButtons[i].addActionListener(this);
            buttonPanel.add(numberButtons[i]);
        }

        operatorButtons = new JButton[5];
        operatorButtons[0] = new JButton("=");
        operatorButtons[1] = new JButton("sin");
        operatorButtons[2] = new JButton("cos");
        operatorButtons[3] = new JButton("tan");
        operatorButtons[4] = new JButton("^");
        for (int i = 0; i < operatorButtons.length; i++) {
            operatorButtons[i].addActionListener(this);
            buttonPanel.add(operatorButtons[i]);
        }

        clearButton = new JButton("C");
        clearButton.addActionListener(this);
        buttonPanel.add(clearButton);

        resetButton = new JButton("AC");
        resetButton.addActionListener(this);
        buttonPanel.add(resetButton);

        hexButton = new JButton("HEX");
        hexButton.addActionListener(this);
        buttonPanel.add(hexButton);

        binButton = new JButton("BIN");
        binButton.addActionListener(this);
        buttonPanel.add(binButton);

        decButton = new JButton("DEC");
        decButton.addActionListener(this);
        buttonPanel.add(decButton);

        add(buttonPanel, BorderLayout.CENTER);

        setVisible(true);
        base = 10; // 默认十进制
    }

    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        if ("0123456789.".indexOf(command) >= 0) { // 数字键
            inputField.setText(inputField.getText() + command);
        } else if ("+-*/^".indexOf(command) >= 0) { // 操作符键
            try {
                double input = Double.parseDouble(inputField.getText());
                if (currentOperator == 0) {
                    result = input;
                } else if (currentOperator == 1) {
                    result += input;
                } else if (currentOperator == 2) {
                    result -= input;
                } else if (currentOperator == 3) {
                    result *= input;
                } else if (currentOperator == 4) {
                    result /= input;
                } else if (currentOperator == 5) {
                    result = Math.pow(result, input);
                }
                inputField.setText("");
                currentOperator = "+-*/^".indexOf(command) + 1;
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("=")) { // 等号键
            try {
                double input = Double.parseDouble(inputField.getText());
                if (currentOperator == 1) {
                    result += input;
                } else if (currentOperator == 2) {
                    result -= input;
                } else if (currentOperator == 3) {
                    result *= input;
                } else if (currentOperator == 4) {
                    result /= input;
                } else if (currentOperator == 5) {
                    result = Math.pow(result, input);
                }
                inputField.setText(Double.toString(result));
                currentOperator = 0;
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("C")) { // 清除键
            inputField.setText("");
        } else if (command.equals("AC")) { // 归零键
            inputField.setText("");
            currentOperator = 0;
            result = 0;
        } else if (command.equals("HEX")) { // 十六进制转换键
            try {
                int input = Integer.parseInt(inputField.getText(), base);
                inputField.setText(Integer.toHexString(input));
                base = 16;
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("BIN")) { // 二进制转换键
            try {
                int input = Integer.parseInt(inputField.getText(), base);
                inputField.setText(Integer.toBinaryString(input));
                base = 2;
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("DEC")) { // 十进制转换键
            try {
                int input = Integer.parseInt(inputField.getText(), base);
                inputField.setText(Integer.toString(input));
                base = 10;
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("+/-")) { // 正负号键
            try {
                double input = Double.parseDouble(inputField.getText());
                inputField.setText(Double.toString(-input));
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("(")) { // 左括号键
            inputField.setText(inputField.getText() + "(");
        } else if (command.equals(")")) { // 右括号键
            inputField.setText(inputField.getText() + ")");
        } else if (command.equals("sin")) { // sin键
            try {
                double input = Double.parseDouble(inputField.getText());
                inputField.setText(Double.toString(Math.sin(input)));
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("cos")) { // cos键
            try {
                double input = Double.parseDouble(inputField.getText());
                inputField.setText(Double.toString(Math.cos(input)));
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("tan")) { // tan键
            try {
                double input = Double.parseDouble(inputField.getText());
                inputField.setText(Double.toString(Math.tan(input)));
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        } else if (command.equals("^")) { // 幂运算键
            try {
                double input = Double.parseDouble(inputField.getText());
                if (currentOperator == 0) {
                    result = input;
                } else if (currentOperator == 1) {
                    result += input;
                } else if (currentOperator == 2) {
                    result -= input;
                } else if (currentOperator == 3) {
                    result *= input;
                } else if (currentOperator == 4) {
                    result /= input;
                } else if (currentOperator == 5) {
                    result = Math.pow(result, input);
                }
                inputField.setText("");
                currentOperator = 5;
            } catch (NumberFormatException ex) {
                inputField.setText("Error");
            }
        }
    }

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

}