03-类和对象——课后作业:跟踪某个类所创建对象的个数

程序源代码:

 1 import java.util.Scanner;
 2 
 3 public class NumberCount {
 4     
 5     static int count=0;
 6     
 7     NumberCount()
 8     
 9     {
10         
11         count += 1;
12         
13     }
14     
15     int getCount()
16     
17     {
18         
19         return count;
20         
21     }
22     
23     public static void main(String[] args) {
24         // TODO Auto-generated method stub
25         
26         NumberCount num1 = new NumberCount();
27         
28         NumberCount num2 = new NumberCount();
29         
30         NumberCount num3 = new NumberCount();
31         
32         NumberCount num4 = new NumberCount();
33         
34         System.out.println("你已经创建了"+NumberCount.count+"个对象");
35         
36     }
37 
38 }

执行结果:

posted @ 2017-10-20 09:26  编程小大白  阅读(238)  评论(0编辑  收藏  举报