first file

src/ProjectStudy/SimpleCalculator.java

@@ -1,55 +0,0 @@
-package ProjectStudy;
-
-import java.util.Scanner;
-
-public class SimpleCalculator {
-
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-
-        System.out.println("欢迎使用简单计算器！");
-        System.out.println("请输入第一个操作数：");
-        double num1 = scanner.nextDouble();
-
-        System.out.println("请输入操作符（+，-，*，/，%）:");
-        char operator = scanner.next().charAt(0);
-
-        System.out.println("请输入第二个操作数：");
-        double num2 = scanner.nextDouble();
-
-        double result;
-
-        switch (operator) {
-            case '+':
-                result = num1 + num2;
-                break;
-            case '-':
-                result = num1 - num2;
-                break;
-            case '*':
-                result = num1 * num2;
-                break;
-            case '/':
-                if (num2 != 0) {
-                    result = num1 / num2;
-                } else {
-                    System.out.println("错误：除数不能为零！");
-                    return;
-                }
-                break;
-            case '%':
-                if (num2 != 0 && Math.abs(num2) == (int) Math.abs(num2)) { // 检查第二个操作数是整数
-                    result = (int) num1 % (int) num2;
-                } else {
-                    System.out.println("错误：取余操作要求第二个操作数是整数！");
-                    return;
-                }
-                break;
-            default:
-                System.out.println("错误：无效的操作符！");
-                return;
-        }
-
-        System.out.println("结果是：" + result);
-    }
-}

src/main/java/SimpleCalculator.java

@@ -0,0 +1,97 @@
+package ProjectStudy;
+
+
+import java.awt.BorderLayout;
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+import javax.swing.SwingUtilities;
+
+public class SimpleCalculator extends JFrame implements ActionListener {
+    private JTextField display;
+    private double num1 = 0.0;
+    private double num2 = 0.0;
+    private char operator = ' ';
+    private boolean start = true;
+
+    public SimpleCalculator() {
+        this.setTitle("简单计算器");
+        this.setSize(300, 400);
+        this.setDefaultCloseOperation(3);
+        this.setLayout(new BorderLayout());
+        this.display = new JTextField();
+        this.display.setHorizontalAlignment(4);
+        this.add(this.display, "North");
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.setLayout(new GridLayout(4, 4));
+        String[] buttonLabels = new String[]{"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
+        String[] var3 = buttonLabels;
+        int var4 = buttonLabels.length;
+
+        for (int var5 = 0; var5 < var4; ++var5) {
+            String label = var3[var5];
+            JButton button = new JButton(label);
+            button.addActionListener(this);
+            buttonPanel.add(button);
+        }
+
+        this.add(buttonPanel, "Center");
+    }
+
+    public void actionPerformed(ActionEvent e) {
+        String command = e.getActionCommand();
+        if (!command.matches("[0-9]") && !command.equals(".")) {
+            if (command.matches("[+\\-*/]")) {
+                this.num1 = Double.parseDouble(this.display.getText());
+                this.operator = command.charAt(0);
+                this.start = true;
+            } else if (command.equals("=")) {
+                this.num2 = Double.parseDouble(this.display.getText());
+                double result = this.calculate(this.num1, this.num2, this.operator);
+                this.display.setText(String.valueOf(result));
+                this.start = true;
+            }
+        } else if (this.start) {
+            this.display.setText(command);
+            this.start = false;
+        } else {
+            this.display.setText(this.display.getText() + command);
+        }
+
+    }
+
+    private double calculate(double num1, double num2, char operator) {
+        switch (operator) {
+            case '*':
+                return num1 * num2;
+            case '+':
+                return num1 + num2;
+            case ',':
+            case '.':
+            default:
+                JOptionPane.showMessageDialog(this, "错误：无效的操作符！");
+                return 0.0;
+            case '-':
+                return num1 - num2;
+            case '/':
+                if (num2 != 0.0) {
+                    return num1 / num2;
+                } else {
+                    JOptionPane.showMessageDialog(this, "错误：除数不能为零！");
+                    return 0.0;
+                }
+        }
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            SimpleCalculator calculator = new SimpleCalculator();
+            calculator.setVisible(true);
+        });
+    }
+}