diff --git a/src/class40/Car.java b/src/class40/Car.java
new file mode 100644
index 0000000..35f42a8
--- /dev/null
+++ b/src/class40/Car.java
@@ -0,0 +1,12 @@
+package class40;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class Car {
+    String name;
+}
diff --git a/src/class40/Demo3.java b/src/class40/Demo3.java
index 6813a34..979024f 100644
--- a/src/class40/Demo3.java
+++ b/src/class40/Demo3.java
@@ -28,6 +28,5 @@ public class Demo3 {
         System.out.println(Arrays.toString(names));
 
 
-
     }
 }
diff --git a/src/class40/Demo4.java b/src/class40/Demo4.java
new file mode 100644
index 0000000..f16c78a
--- /dev/null
+++ b/src/class40/Demo4.java
@@ -0,0 +1,17 @@
+package class40;
+
+public class Demo4 {
+    public static void main(String[] args) {
+        CarFactory cf = new CarFactory() {
+            @Override
+            public Car getCar(String name) {
+                return new Car(name);
+            }
+        };
+        CarFactory cf2 = Car::new; // lambda表达式
+
+    }
+}
+interface CarFactory{
+    Car getCar(String name);
+}