用java代码生成一个计算器

要生成一个计算器，可以使用Java语言中的Swing类库。例如，可以使用JFrame类创建一个新窗口，使用JPanel类添加按钮，使用JTextField类创建文本框，并使用ActionListener接口为按钮添加动作。

相关问题

用Java生成一个计算器

好的，我可以为您提供一些Java生成计算器的相关资料和代码，您可以参考以下示例：

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

public class Calculator extends JFrame implements ActionListener {

    private JButton[] buttons;
    private JButton clearBtn, backspaceBtn, equalBtn;
    private JTextField displayField;

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

        // Create display field
        displayField = new JTextField(20);
        displayField.setEditable(false);
        displayField.setHorizontalAlignment(JTextField.RIGHT);

        // Create buttons
        buttons = new JButton[10];
        for (int i = 0; i < 10; i++) {
            buttons[i] = new JButton(String.valueOf(i));
            buttons[i].addActionListener(this);
        }

        // Create operations buttons
        clearBtn = new JButton("C");
        clearBtn.addActionListener(this);
        backspaceBtn = new JButton("<-");
        backspaceBtn.addActionListener(this);
        equalBtn = new JButton("=");
        equalBtn.addActionListener(this);

        // Create layout
        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 3, 5, 5));
        for (int i = 1; i <= 9; i++) {
            buttonPanel.add(buttons[i]);
        }
        buttonPanel.add(clearBtn);
        buttonPanel.add(buttons[0]);
        buttonPanel.add(backspaceBtn);
        buttonPanel.add(equalBtn);

        // Add components
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(displayField, BorderLayout.NORTH);
        getContentPane().add(buttonPanel, BorderLayout.CENTER);

        // Set basic settings
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(250, 250);
        setLocationRelativeTo(null);
        setResizable(false);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        Object source = e.getSource();
        if (source == clearBtn) {
            displayField.setText("");
        } else if (source == backspaceBtn) {
            String text = displayField.getText();
            if (text.length() > 0) {
                displayField.setText(text.substring(0, text.length() - 1));
            }
        } else if (source == equalBtn) {
            String text = displayField.getText();
            if (text.length() > 0) {
                try {
                    // Calculate result
                    ScriptEngineManager mgr = new ScriptEngineManager();
                    ScriptEngine engine = mgr.getEngineByName("JavaScript");
                    String result = String.valueOf(engine.eval(text));
                    displayField.setText(result);
                } catch (Exception ex) {
                    // Handle error
                    JOptionPane.showMessageDialog(this, "Invalid input", "Error", JOptionPane.ERROR_MESSAGE);
                }
            }
        } else {
            JButton button = (JButton) source;
            displayField.setText(displayField.getText() + button.getText());
        }
    }

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

此代码是一个基本的Java图形界面计算器，使用了AWT和Swing API，利用ScriptEngineManager API实现简单的计算功能。您可以在此基础上进行更多的功能扩展和优化。希望能对您有所帮助！

用java生成一个计算器代码包括加减乘除乘方和根

在Java中创建一个基本的四则运算计算器，以及支持乘方和开方的功能，可以按照下面的步骤编写：

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("欢迎使用简易计算器!");

        while (true) {
            System.out.println("\n请选择操作：");
            System.out.println("1. 加法");
            System.out.println("2. 减法");
            System.out.println("3. 乘法");
            System.out.println("4. 除法");
            System.out.println("5. 幂运算");
            System.out.println("6. 开平方");
            System.out.print("7. 退出\n");

            int choice = scanner.nextInt();
            double num1, num2;

            if (choice == 7) { // 退出选项
                break;
            } else if (choice >= 1 && choice <= 4) {
                System.out.print("请输入第一个数字：");
                num1 = scanner.nextDouble();
                System.out.print("请输入第二个数字：");
                num2 = scanner.nextDouble();

                switch (choice) {
                    case 1: // 加法
                        System.out.println(num1 + " + " + num2 + " = " + add(num1, num2));
                        break;
                    case 2: // 减法
                        System.out.println(num1 + " - " + num2 + " = " + subtract(num1, num2));
                        break;
                    case 3: // 乘法
                        System.out.println(num1 + " * " + num2 + " = " + multiply(num1, num2));
                        break;
                    case 4: // 除法
                        if (num2 != 0) {
                            System.out.println(num1 + " / " + num2 + " = " + divide(num1, num2));
                        } else {
                            System.out.println("错误! 除数不能为零.");
                        }
                        break;
                }
            } else if (choice == 5) { // 幂运算
                System.out.print("请输入底数：");
                num1 = scanner.nextDouble();
                System.out.print("请输入指数：");
                num2 = scanner.nextDouble();
                System.out.println(num1 + " ^ " + num2 + " = " + power(num1, num2));
            } else if (choice == 6) { // 开平方
                System.out.print("请输入一个非负数：");
                num1 = scanner.nextDouble();
                if (num1 >= 0) {
                    System.out.println("sqrt(" + num1 + ") = " + Math.sqrt(num1));
                } else {
                    System.out.println("错误! 只能计算非负数的平方根.");
                }
            } else {
                System.out.println("无效的选择, 请重新输入.");
            }

            System.out.println();
        }
        scanner.close();
    }

    // 数学函数实现
    private static double add(double a, double b) {
        return a + b;
    }

    private static double subtract(double a, double b) {
        return a - b;
    }

    private static double multiply(double a, double b) {
        return a * b;
    }

    private static double divide(double a, double b) {
        return a / b;
    }

    private static double power(double base, double exponent) {
        return Math.pow(base, exponent);
    }
}