diff --git a/day07/src/com/inmind/arraylist03/Car.java b/day07/src/com/inmind/arraylist03/Car.java
new file mode 100644
index 0000000..e39ba03
--- /dev/null
+++ b/day07/src/com/inmind/arraylist03/Car.java
@@ -0,0 +1,16 @@
+package com.inmind.arraylist03;
+
+public class Car {
+    String brand;
+    double price;
+    String color;
+
+    public Car() {
+    }
+
+    public Car(String brand, double price, String color) {
+        this.brand = brand;
+        this.price = price;
+        this.color = color;
+    }
+}
diff --git a/day07/src/com/inmind/arraylist03/Demo07.java b/day07/src/com/inmind/arraylist03/Demo07.java
new file mode 100644
index 0000000..b34fea5
--- /dev/null
+++ b/day07/src/com/inmind/arraylist03/Demo07.java
@@ -0,0 +1,19 @@
+package com.inmind.arraylist03;
+
+public class Demo07 {
+    public static void main(String[] args) {
+        //定义一个保存车的容器，长度3
+        Car[] carArr = new Car[3];
+        carArr[0] = new Car("小米",45.5,"白色");
+        carArr[1] = new Car("问界",55.5,"黑色");
+        carArr[2] = new Car("理想",25.5,"灰色");
+
+        for (int i = 0; i < carArr.length; i++) {
+            System.out.println(carArr[i]);
+        }
+        //对象数组，还想添加2个车？？不能，除非创建一个新的更长的数组
+        //对象数组能直接删除一个车对象？？不能，只能修改
+        //为了解决以上的问题，有个更好的容器，ArrayList集合
+        //ArrayList的好处：1.长度可变，2.可以增删改查 3.可以存放任意的【引用类型】
+    }
+}