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@ -1,7 +1,9 @@
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package compute;
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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.KeyAdapter;
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import java.awt.event.KeyEvent;
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public class SimpleCalculator {
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@ -10,128 +12,82 @@ public class SimpleCalculator {
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private double num1;
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private double num2;
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private String operator;
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private double memory; // Memory for M+, M-, MR, and MC functionality
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public SimpleCalculator() {
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frame = new JFrame("简单计算器");
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inputField = new JTextField();
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inputField.setEditable(false);
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inputField.setHorizontalAlignment(SwingConstants.RIGHT);
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inputField.setFont(new Font("Arial", Font.BOLD, 24));
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inputField.setPreferredSize(new Dimension(400, 50));
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inputField.setFont(new Font("Arial", Font.PLAIN, 24));
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inputField.setHorizontalAlignment(JTextField.RIGHT);
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// 创建按钮
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JButton btn1 = createButton("1");
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JButton btn2 = createButton("2");
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JButton btn3 = createButton("3");
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JButton btn4 = createButton("4");
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JButton btn5 = createButton("5");
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JButton btn6 = createButton("6");
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JButton btn7 = createButton("7");
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JButton btn8 = createButton("8");
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JButton btn9 = createButton("9");
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JButton btn0 = createButton("0");
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JButton btnAdd = createButton("+");
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JButton btnSubtract = createButton("-");
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JButton btnMultiply = createButton("*");
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JButton btnDivide = createButton("/");
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JButton btnEqual = createButton("=");
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JButton btnClear = createButton("C");
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JButton btnDecimal = createButton(".");
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JButton btnNegate = createButton("+/-");
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JButton btnMPlus = createButton("M+");
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JButton btnMMinus = createButton("M-");
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JButton btnMR = createButton("MR");
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JButton btnMC = createButton("MC");
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JButton[] buttons = new JButton[16];
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String[] buttonLabels = {"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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for (int i = 0; i < buttonLabels.length; i++) {
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buttons[i] = new JButton(buttonLabels[i]);
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buttons[i].setFont(new Font("Arial", Font.PLAIN, 24));
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buttons[i].setFocusable(false);
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buttons[i].setBackground(Color.LIGHT_GRAY);
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buttons[i].setBorder(BorderFactory.createLineBorder(Color.GRAY));
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final String label = buttonLabels[i];
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buttons[i].addActionListener(e -> handleButtonClick(label));
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}
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// 设置布局
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JPanel panel = new JPanel();
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panel.setLayout(new GridLayout(6, 4, 5, 5)); // 网格布局，间距为5像素
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panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
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panel.add(btn7);
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panel.add(btn8);
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panel.add(btn9);
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panel.add(btnDivide);
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panel.add(btn4);
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panel.add(btn5);
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panel.add(btn6);
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panel.add(btnMultiply);
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panel.add(btn1);
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panel.add(btn2);
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panel.add(btn3);
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panel.add(btnSubtract);
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panel.add(btn0);
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panel.add(btnDecimal);
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panel.add(btnNegate);
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panel.add(btnAdd);
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panel.add(btnClear);
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panel.add(btnEqual);
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panel.add(btnMPlus);
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panel.add(btnMMinus);
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panel.add(btnMR);
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panel.add(btnMC);
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// 添加事件监听器
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btn1.addActionListener(e -> appendToInputField("1"));
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btn2.addActionListener(e -> appendToInputField("2"));
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btn3.addActionListener(e -> appendToInputField("3"));
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btn4.addActionListener(e -> appendToInputField("4"));
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btn5.addActionListener(e -> appendToInputField("5"));
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btn6.addActionListener(e -> appendToInputField("6"));
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btn7.addActionListener(e -> appendToInputField("7"));
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btn8.addActionListener(e -> appendToInputField("8"));
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btn9.addActionListener(e -> appendToInputField("9"));
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btn0.addActionListener(e -> appendToInputField("0"));
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btnDecimal.addActionListener(e -> appendDecimal());
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btnNegate.addActionListener(e -> negateValue());
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btnAdd.addActionListener(e -> setOperator("+"));
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btnSubtract.addActionListener(e -> setOperator("-"));
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btnMultiply.addActionListener(e -> setOperator("*"));
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btnDivide.addActionListener(e -> setOperator("/"));
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btnEqual.addActionListener(e -> calculateResult());
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btnClear.addActionListener(e -> clearInput());
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btnMPlus.addActionListener(e -> memoryPlus());
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btnMMinus.addActionListener(e -> memoryMinus());
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btnMR.addActionListener(e -> memoryRecall());
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btnMC.addActionListener(e -> memoryClear());
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panel.setLayout(new GridLayout(4, 4, 10, 10));
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for (JButton button : buttons) {
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panel.add(button);
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}
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// 设置窗体
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setSize(400, 600); // 调整窗体大小
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frame.setLayout(new BorderLayout(5, 5));
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frame.setSize(400, 400);
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frame.setLayout(new BorderLayout());
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frame.add(inputField, BorderLayout.NORTH);
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frame.add(panel, BorderLayout.CENTER);
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frame.setVisible(true);
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frame.setLocationRelativeTo(null); // 窗口居中
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frame.addKeyListener(new KeyAdapter() { // 支持键盘输入
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@Override
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public void keyPressed(KeyEvent e) {
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char keyChar = e.getKeyChar();
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if (Character.isDigit(keyChar) || keyChar == '.' || "+-*/=".indexOf(keyChar) >= 0) {
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handleButtonClick(String.valueOf(keyChar));
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}
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if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
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clearInput();
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}
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}
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});
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}
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private JButton createButton(String text) {
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JButton button = new JButton(text);
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button.setFont(new Font("Arial", Font.PLAIN, 18));
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button.setPreferredSize(new Dimension(80, 80));
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button.setBackground(Color.LIGHT_GRAY);
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button.setFocusPainted(false);
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return button;
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private void handleButtonClick(String label) {
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switch (label) {
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case "C":
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clearInput();
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break;
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case "=":
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calculateResult();
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break;
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default:
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if ("+-*/".contains(label)) {
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setOperator(label);
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} else {
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appendToInputField(label);
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}
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break;
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}
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}
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private void appendToInputField(String value) {
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inputField.setText(inputField.getText() + value);
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}
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private void appendDecimal() {
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if (!inputField.getText().contains(".")) {
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inputField.setText(inputField.getText() + ".");
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}
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}
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private void negateValue() {
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if (!inputField.getText().isEmpty()) {
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double value = Double.parseDouble(inputField.getText());
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inputField.setText(String.valueOf(value * -1));
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}
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}
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private void setOperator(String op) {
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num1 = Double.parseDouble(inputField.getText());
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operator = op;
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@ -164,42 +120,16 @@ public class SimpleCalculator {
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}
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inputField.setText(String.valueOf(result));
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} catch (NumberFormatException e) {
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JOptionPane.showMessageDialog(frame, "错误：无效的输入。");
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JOptionPane.showMessageDialog(frame, "无效输入，请检查。");
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}
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}
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private void clearInput() {
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inputField.setText("");
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num1 = 0;
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num2 = 0;
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num1 = num2 = 0;
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operator = "";
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}
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private void memoryPlus() {
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try {
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memory += Double.parseDouble(inputField.getText());
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} catch (NumberFormatException e) {
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JOptionPane.showMessageDialog(frame, "错误：无效的输入。");
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}
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}
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private void memoryMinus() {
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try {
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memory -= Double.parseDouble(inputField.getText());
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} catch (NumberFormatException e) {
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JOptionPane.showMessageDialog(frame, "错误：无效的输入。");
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}
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}
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private void memoryRecall() {
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inputField.setText(String.valueOf(memory));
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}
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private void memoryClear() {
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memory = 0;
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(SimpleCalculator::new);
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}
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