第一次提交

src/main/java/ConcreteProductA.java

@@ -0,0 +1,6 @@
+public class ConcreteProductA implements Product {
+    @Override
+    public void operation() {
+        System.out.println("ConcreteProductA operation");
+    }
+}

src/main/java/ConcreteProductB.java

@@ -0,0 +1,6 @@
+public class ConcreteProductB implements Product {
+    @Override
+    public void operation() {
+        System.out.println("ConcreteProductB operation");
+    }
+}

src/main/java/Factory.java

@@ -0,0 +1,13 @@
+public class Factory {
+    public static Product createProduct(String type) {
+        if (type == null) {
+            return null;
+        }
+        if (type.equalsIgnoreCase("A")) {
+            return new ConcreteProductA();
+        } else if (type.equalsIgnoreCase("B")) {
+            return new ConcreteProductB();
+        }
+        return null;
+    }
+}

src/main/java/FactoryTest.java

@@ -0,0 +1,17 @@
+public class FactoryTest {
+    public static void main(String[] args) {
+        // 测试创建ConcreteProductA
+        Product productA = Factory.createProduct("A");
+        System.out.println("创建产品A：");
+        productA.operation();
+        
+        // 测试创建ConcreteProductB
+        Product productB = Factory.createProduct("B");
+        System.out.println("\n创建产品B：");
+        productB.operation();
+        
+        // 测试无效类型
+        Product invalidProduct = Factory.createProduct("C");
+        System.out.println("\n创建无效产品：" + (invalidProduct == null ? "返回null" : "失败"));
+    }
+}

src/main/java/Product.java

@@ -0,0 +1,3 @@
+public interface Product {
+    void operation();
+}