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Calculator.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Calculator extends JFrame implements ActionListener {
+    private JTextField display;
+    private double num1 = 0, num2 = 0, result = 0;
+    private String operation = "";
+
+    public Calculator() {
+        setTitle("简易计算器");
+        setSize(400, 600);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLayout(new BorderLayout());
+
+        // 显示屏
+        display = new JTextField();
+        display.setEditable(false);
+        display.setHorizontalAlignment(JTextField.RIGHT);
+        add(display, BorderLayout.NORTH);
+
+        // 按钮面板
+        JPanel panel = new JPanel();
+        panel.setLayout(new GridLayout(4, 4, 10, 10));
+        String[] buttons = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "C", "0", "=", "+"};
+        for (String text : buttons) {
+            JButton button = new JButton(text);
+            button.addActionListener(this);
+            panel.add(button);
+        }
+        add(panel, BorderLayout.CENTER);
+
+        setVisible(true);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        String command = e.getActionCommand();
+        if (command.equals("C")) {
+            clearDisplay();
+        } else if (command.equals("=")) {
+            calculateResult();
+        } else {
+            handleInput(command);
+        }
+    }
+
+    private void handleInput(String input) {
+        if (input.matches("[0-9]")) {
+            display.setText(display.getText() + input);
+        } else {
+            operation = input;
+            num1 = Double.parseDouble(display.getText());
+            display.setText("");
+        }
+    }
+
+    private void calculateResult() {
+        num2 = Double.parseDouble(display.getText());
+        switch (operation) {
+            case "+":
+                result = num1 + num2;
+                break;
+            case "-":
+                result = num1 - num2;
+                break;
+            case "*":
+                result = num1 * num2;
+                break;
+            case "/":
+                if (num2 != 0) {
+                    result = num1 / num2;
+                } else {
+                    display.setText("Error");
+                    return;
+                }
+                break;
+            case "%":
+                result = num1 % num2;
+                break;
+        }
+        display.setText(String.valueOf(result));
+    }
+
+    private void clearDisplay() {
+        display.setText("");
+        num1 = 0;
+        num2 = 0;
+        result = 0;
+        operation = "";
+    }
+
+    public static void main(String[] args) {
+        new Calculator();
+    }
+}