第四次修改

Calculator/src/Calculator.java

@@ -18,14 +18,14 @@ public class Calculator extends JFrame implements ActionListener {
         add(textField, BorderLayout.NORTH);
 
         JPanel panel = new JPanel();
-        panel.setLayout(new GridLayout(5, 4, 10, 10)); // 增加网格布局的间距
+        panel.setLayout(new GridLayout(6, 4, 10, 10)); // 修改为6行以容纳根号按钮
 
         String[] buttons = {
-                "7", "8", "9", "/",
+                "7", "8", "9", "÷",
-                "4", "5", "6", "*",
+                "4", "5", "6", "×",
                 "1", "2", "3", "-",
                 "C", "0", ".", "+",
-                "="
+                "√", "=", ""
         };
 
         for (String text : buttons) {
@@ -37,7 +37,7 @@ public class Calculator extends JFrame implements ActionListener {
 
         add(panel, BorderLayout.CENTER);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        setSize(1000, 600); // 设置窗口大小为宽800像素，高500像素
+        setSize(400, 600); // 修改窗口大小为宽400像素，高600像素以适应新布局
         setLocationRelativeTo(null); // 窗口居中显示
         pack();
         setVisible(true);
@@ -62,8 +62,8 @@ public class Calculator extends JFrame implements ActionListener {
                     break;
                 case "+":
                 case "-":
-                case "*":
+                case "×":
-                case "/":
+                case "÷":
                     if (!calculating) {
                         result = Double.parseDouble(textField.getText());
                         operator = command;
@@ -75,6 +75,9 @@ public class Calculator extends JFrame implements ActionListener {
                         calculate(Double.parseDouble(textField.getText()));
                     }
                     break;
+                case "√":
+                    calculateMathFunction();
+                    break;
             }
         }
     }
@@ -87,10 +90,10 @@ public class Calculator extends JFrame implements ActionListener {
             case "-":
                 result -= n;
                 break;
-            case "*":
+            case "×":
                 result *= n;
                 break;
-            case "/":
+            case "÷":
                 if (n != 0) {
                     result /= n;
                 } else {
@@ -108,6 +111,17 @@ public class Calculator extends JFrame implements ActionListener {
         calculating = true;
     }
 
+    private void calculateMathFunction() {
+        try {
+            double num = Double.parseDouble(textField.getText());
+            result = Math.sqrt(num);
+            textField.setText(String.valueOf(result));
+        } catch (NumberFormatException ex) {
+            JOptionPane.showMessageDialog(this, "请输入一个有效的数字");
+        }
+        calculating = true;
+    }
+
     public static void main(String[] args) {
         new Calculator();
     }