diff --git "a/docs/\346\235\202\350\260\210/\350\256\276\350\256\241\346\250\241\345\274\217\347\232\204\350\215\274\346\257\222\344\275\223\347\216\260\345\234\250\345\223\252.md" "b/docs/\346\235\202\350\260\210/\350\256\276\350\256\241\346\250\241\345\274\217\347\232\204\350\215\274\346\257\222\344\275\223\347\216\260\345\234\250\345\223\252.md"
index ac935de..e763f68 100644
--- "a/docs/\346\235\202\350\260\210/\350\256\276\350\256\241\346\250\241\345\274\217\347\232\204\350\215\274\346\257\222\344\275\223\347\216\260\345\234\250\345\223\252.md"
+++ "b/docs/\346\235\202\350\260\210/\350\256\276\350\256\241\346\250\241\345\274\217\347\232\204\350\215\274\346\257\222\344\275\223\347\216\260\345\234\250\345\223\252.md"
@@ -2,11 +2,74 @@
 
 假如我有一个加减乘除的方法，我可以这样写：
 
-<img src="https://cdn.jsdelivr.net/gh/01Petard/imageURL@main/img/202412021838343.png" alt="image-20241202183805321" style="zoom:50%;" />
+```java
+public int calculate(int numa, int numb, char operation) {
+    switch (operation) {
+        case '+':
+            return numa + numb;
+        case '-':
+            return numa - numb;
+        case '*':
+            return numa * numb;
+        case '/':
+            return numa / numb;
+        default:
+            return 0;
+    }
+}
+```
 
 但如果我希望后续支持更多的计算模式，用了策略模式后，就变成了这样，代码变多了，逻辑也复杂了很多：
 
-<img src="https://cdn.jsdelivr.net/gh/01Petard/imageURL@main/img/202412021837157.png" alt="image-20241202183754131" style="zoom:50%;" />
+```java
+public interface Operation {
+    int calculate(int numa, int numb);
+}
+```
+
+```java
+public class Addition implements Operation {
+    @Override
+    public int calculate(int numa, int numb) {
+        return numa + numb;
+    }
+}
+public class Subtraction implements Operation {
+    @Override
+    public int calculate(int numa, int numb) {
+        return numa - numb;
+    }
+}
+public class Multiplication implements Operation {
+    @Override
+    public int calculate(int numa, int numb) {
+        return numa * numb;
+    }
+}
+public class Division implements Operation {
+    @Override
+    public int calculate(int numa, int numb) {
+        return numa / numb;
+    }
+}
+```
+
+```java
+public class OperationFactory {
+    private static final Map<String, Operation> operations = new HashMap<>();
+
+    static {
+        operations.put("+", new Addition());
+        operations.put("-", new Subtraction());
+        operations.put("*", new Multiplication());
+        operations.put("/", new Division());
+    }
+
+    public static Operation getOperation(String operation) {
+        return operations.get(operation);
+    }
+}
+```
 
 ## 设计模式的荼毒体现在哪？