黄秀彤第三次修改

BaseConversion2.java

@@ -1,57 +1,50 @@
-
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 
 public class BaseConversion2 {
+
+    // 将指定进制的数字转换为十进制
     public static int convertToDecimal(String number, int base) {
         int decimalValue = 0;
-        int power = 0;
+        int power = 1; // 初始值为1，对应于base^0
 
         for (int i = number.length() - 1; i >= 0; i--) {
             char digit = number.charAt(i);
-            int digitValue;
+            int digitValue = Character.isDigit(digit)
+                    ? digit - '0'
+                    : Character.toUpperCase(digit) - 'A' + 10; // A-F
 
-            if (Character.isDigit(digit)) {
-                digitValue = digit - '0';
-            } else {
-                digitValue = Character.toUpperCase(digit) - 'A' + 10; // A-F
-            }
-
-            decimalValue += digitValue * Math.pow(base, power);
-            power++;
+            decimalValue += digitValue * power;
+            power *= base; // 更新权重
         }
 
         return decimalValue;
     }
 
+    // 将十进制转换为指定进制
     public static String convertFromDecimal(int number, int base) {
-        StringBuilder result = new StringBuilder();
-
-        if (number == 0) {
-            return "0";
-        }
+        if (number == 0) return "0"; // 特殊情况处理
 
+        StringBuilder result = new StringBuilder();
         while (number > 0) {
             int remainder = number % base;
-            if (remainder < 10) {
-                result.append((char) ('0' + remainder));
-            } else {
-                result.append((char) ('A' + remainder - 10));
-            }
+            result.append(remainder < 10 ? (char) ('0' + remainder) : (char) ('A' + remainder - 10));
             number /= base;
         }
 
-        return result.reverse().toString();
+        return result.reverse().toString(); // 反转结果
     }
 
+    // 主方法，创建用户界面
     public static void main(String[] args) {
         JFrame frame = new JFrame("基数转换器");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setSize(400, 300);
         frame.setLayout(new GridLayout(5, 2));
 
+        // 创建界面组件
         JLabel sourceBaseLabel = new JLabel("源进制 (2-16):");
         JTextField sourceBaseField = new JTextField();
 
@@ -64,26 +57,34 @@ public class BaseConversion2 {
         JButton convertButton = new JButton("转换");
         JLabel resultLabel = new JLabel("转换结果:");
 
+        // 事件处理
         convertButton.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
                 try {
                     int sourceBase = Integer.parseInt(sourceBaseField.getText());
                     int targetBase = Integer.parseInt(targetBaseField.getText());
-                    String number = numberField.getText();
+                    String number = numberField.getText().toUpperCase();
+
+                    // 输入验证
+                    if (!isValidInput(number, sourceBase)) {
+                        resultLabel.setText("请输入有效的数字!");
+                        return;
+                    }
 
                     int decimalValue = convertToDecimal(number, sourceBase);
                     String result = convertFromDecimal(decimalValue, targetBase);
 
                     resultLabel.setText("转换结果: " + result);
                 } catch (NumberFormatException ex) {
-                    resultLabel.setText("请输入有效的数字和进制!");
+                    resultLabel.setText("进制应为数字，且范围为 2-16!");
                 } catch (Exception ex) {
                     resultLabel.setText("转换过程中发生错误: " + ex.getMessage());
                 }
             }
         });
 
+        // 添加组件到框架
         frame.add(sourceBaseLabel);
         frame.add(sourceBaseField);
         frame.add(targetBaseLabel);
@@ -95,4 +96,19 @@ public class BaseConversion2 {
 
         frame.setVisible(true);
     }
+
+    // 检查用户输入的数字是否有效
+    private static boolean isValidInput(String number, int base) {
+        for (char digit : number.toCharArray()) {
+            int digitValue = Character.isDigit(digit)
+                    ? digit - '0'
+                    : Character.toUpperCase(digit) - 'A' + 10;
+
+            if (digitValue < 0 || digitValue >= base) {
+                return false; // 数字超出进制范围
+            }
+        }
+        return true; // 输入有效
     }
+}
+