java课后作业：记录创建对象数

题目描述：

 源码：

 1 public class objectCount {
 2     static int cnt = 0;
 3     public objectCount()
 4     {
 5         cnt++;
 6     }
 7     public static void display()
 8     {
 9         System.out.println("您已经创建了"+cnt+"个对象");
10     }
11     public static void main(String[] args) {
12         // TODO Auto-generated method stub
13         objectCount obj1 = new objectCount();
14         objectCount obj2 = new objectCount();
15         objectCount obj3 = new objectCount();
16         objectCount obj4 = new objectCount();
17         display();
18         objectCount obj5 = new objectCount();
19         objectCount obj6 = new objectCount();
20         objectCount obj7 = new objectCount();
21         display();
22         objectCount obj8 = new objectCount();
23         objectCount obj9 = new objectCount();
24         display();
25     }
26 
27 }

思路：

用静态变量计数，在构造函数中使变量累加即可。

运行结果：