第六次修改

Calculator/src/Calculator.java

@@ -11,14 +11,20 @@ public class Calculator extends JFrame implements ActionListener {
 
     public Calculator() {
         setTitle("计算器");
+
+        // 设置文本字段样式
         textField = new JTextField("0");
         textField.setEditable(false);
-        textField.setHorizontalAlignment(JTextField.RIGHT); // 右对齐显示
-        textField.setFont(new Font("Arial", Font.BOLD, 24)); // 增加文本框字体大小
+        textField.setHorizontalAlignment(JTextField.RIGHT);
+        textField.setFont(new Font("Arial", Font.BOLD, 28));
+        textField.setBackground(new Color(240, 240, 240)); // 设置背景颜色
+        textField.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10)); // 设置边框
+
         add(textField, BorderLayout.NORTH);
 
         JPanel panel = new JPanel();
-        panel.setLayout(new GridLayout(5, 4, 10, 10)); // 修改为5行以适应新布局
+        panel.setLayout(new GridLayout(5, 4, 10, 10));
+        panel.setBackground(new Color(220, 220, 220)); // 设置面板背景颜色
 
         String[] buttons = {
                 "7", "8", "9", "÷",
@@ -29,19 +35,24 @@ public class Calculator extends JFrame implements ActionListener {
         };
 
         for (String text : buttons) {
-            if (!text.isEmpty()) { // 确保不创建空按钮
+            if (!text.isEmpty()) {
                 JButton button = new JButton(text);
-                button.setFont(new Font("Arial", Font.BOLD, 18)); // 增加按钮字体大小
+                button.setFont(new Font("Arial", Font.BOLD, 22));
+                button.setFocusPainted(false); // 去掉按钮焦点时的边框
+                button.setBackground(new Color(180, 180, 180)); // 设置按钮背景颜色
+                button.setForeground(Color.BLACK); // 设置按钮文字颜色
+                button.setBorder(BorderFactory.createLineBorder(Color.BLACK, 2)); // 设置按钮边框
                 button.addActionListener(this);
                 panel.add(button);
             }
         }
 
         add(panel, BorderLayout.CENTER);
+
+        // 设置窗口属性
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        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();
+        setSize(420, 640); // 稍微增大窗口以适应新的布局和样式
+        setLocationRelativeTo(null);
         setVisible(true);
     }
 
@@ -99,7 +110,7 @@ public class Calculator extends JFrame implements ActionListener {
                 if (n != 0) {
                     result /= n;
                 } else {
-                    JOptionPane.showMessageDialog(this, "除数不能为0");
+                    JOptionPane.showMessageDialog(this, "除数不能为0", "错误", JOptionPane.ERROR_MESSAGE);
                     return;
                 }
                 break;
@@ -117,13 +128,13 @@ public class Calculator extends JFrame implements ActionListener {
         try {
             double num = Double.parseDouble(textField.getText());
             result = Math.sqrt(num);
-            if (result == Math.floor(result)) { // 检查结果是否已经是整数
-                textField.setText(String.valueOf((int) result)); // 转换为整数并显示
+            if (result == Math.floor(result)) {
+                textField.setText(String.valueOf((int) result));
             } else {
-                textField.setText(String.valueOf(result)); // 否则显示浮点数
+                textField.setText(String.valueOf(result));
             }
         } catch (NumberFormatException ex) {
-            JOptionPane.showMessageDialog(this, "请输入一个有效的数字");
+            JOptionPane.showMessageDialog(this, "请输入一个有效的数字", "错误", JOptionPane.ERROR_MESSAGE);
         }
         calculating = true;
     }