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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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public class Calculator extends JFrame implements ActionListener {
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private final JTextField textField; // 显示输入和结果的文本框
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private double result = 0; // 计算结果
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private String operator = ""; // 运算符
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private boolean calculating = true; // 是否正在计算中
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public Calculator() {
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setTitle("计算器");
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// 设置文本字段样式
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textField = new JTextField("0");
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textField.setEditable(false);
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textField.setHorizontalAlignment(JTextField.RIGHT);
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textField.setFont(new Font("Arial", Font.BOLD, 28));
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textField.setBackground(new Color(240, 240, 240)); // 设置背景颜色
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textField.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); // 设置边框
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add(textField, BorderLayout.NORTH);
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JPanel panel = new JPanel();
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panel.setLayout(new GridLayout(5, 4, 10, 10));
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panel.setBackground(new Color(220, 220, 220)); // 设置面板背景颜色
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String[] buttons = {
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"7", "8", "9", "÷",
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"4", "5", "6", "×",
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"1", "2", "3", "-",
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"C", "0", ".", "+",
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"√", "=", ""
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};
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for (String text : buttons) {
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if (!text.isEmpty()) {
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JButton button = new JButton(text);
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button.setFont(new Font("Arial", Font.BOLD, 22));
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button.setFocusPainted(false); // 去掉按钮焦点时的边框
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button.setBackground(new Color(180, 180, 180)); // 设置按钮背景颜色
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button.setForeground(Color.BLACK); // 设置按钮文字颜色
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button.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2)); // 设置按钮边框
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button.addActionListener(this);
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panel.add(button);
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}
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}
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add(panel, BorderLayout.CENTER);
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// 设置窗口属性
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setSize(420, 640); // 稍微增大窗口以适应新的布局和样式
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setLocationRelativeTo(null);
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setVisible(true);
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}
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public void actionPerformed(ActionEvent e) {
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String command = e.getActionCommand();
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if ('0' <= command.charAt(0) && command.charAt(0) <= '9' || command.equals(".")) {
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if (calculating) {
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textField.setText(command);
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calculating = false;
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} else {
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textField.setText(textField.getText() + command);
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}
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} else {
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switch (command) {
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case "C":
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textField.setText("0");
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operator = "";
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result = 0;
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calculating = true;
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break;
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case "+":
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case "-":
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case "×":
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case "÷":
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if (!calculating) {
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result = Double.parseDouble(textField.getText());
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operator = command;
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calculating = true;
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}
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break;
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case "=":
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if (!calculating) {
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calculate(Double.parseDouble(textField.getText()));
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}
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break;
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case "√":
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calculateMathFunction();
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break;
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}
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}
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}
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private void calculate(double n) {
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switch (operator) {
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case "+":
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result += n;
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break;
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case "-":
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result -= n;
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break;
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case "×":
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result *= n;
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break;
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case "÷":
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if (n != 0) {
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result /= n;
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} else {
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JOptionPane.showMessageDialog(this, "除数不能为0", "错误", JOptionPane.ERROR_MESSAGE);
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return;
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}
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break;
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}
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if (result == Math.floor(result)) {
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textField.setText(String.valueOf((int) result));
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} else {
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textField.setText(String.valueOf(result));
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}
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operator = "";
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calculating = true;
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}
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private void calculateMathFunction() {
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try {
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double num = Double.parseDouble(textField.getText());
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result = Math.sqrt(num);
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if (result == Math.floor(result)) {
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textField.setText(String.valueOf((int) result));
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} else {
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textField.setText(String.valueOf(result));
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}
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} catch (NumberFormatException ex) {
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JOptionPane.showMessageDialog(this, "请输入一个有效的数字", "错误", JOptionPane.ERROR_MESSAGE);
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}
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calculating = true;
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}
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public static void main(String[] args) {
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new Calculator();
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}
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}
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