参数校验

src/test/java/com/greenorange/promotion/FactoryDemo.java

@@ -0,0 +1,59 @@
+package com.greenorange.promotion;
+
+import org.junit.jupiter.api.Test;
+
+public class FactoryDemo {
+
+    @Test
+    public void ClientTest() {
+        CarFactory bmwFactory = new BMWFactory();
+        Car bmw = bmwFactory.createCar();
+        bmw.drive(); // 输出: Driving a BMW car
+
+        CarFactory benzFactory = new BenzFactory();
+        Car benz = benzFactory.createCar();
+        benz.drive(); // 输出: Driving a Benz car
+    }
+
+
+}
+
+
+
+
+interface Car {
+    void drive();
+}
+
+class BMWCar implements Car {
+    @Override
+    public void drive() {
+        System.out.println("Driving a BMW car");
+    }
+}
+
+class BenzCar implements Car {
+    @Override
+    public void drive() {
+        System.out.println("Driving a Benz car");
+    }
+}
+
+interface CarFactory {
+    Car createCar();
+}
+
+
+class BMWFactory implements CarFactory {
+    @Override
+    public Car createCar() {
+        return new BMWCar();
+    }
+}
+
+class BenzFactory implements CarFactory {
+    @Override
+    public Car createCar() {
+        return new BenzCar();
+    }
+}