Java学习之模板方法设计模式

 1 //获取某方法的执行时间
 2 abstract class GetTime
 3 {
 4     public final void getTime()
 5     {
 6         long start = System.currentTimeMillis();
 7 
 8         runcode();
 9 
10         long end = System.currentTimeMillis();
11 
12         System.out.println("毫秒："+(end-start));
13     }
14     public abstract void runcode();
15 
16 }
17 
18 //具体方法实现
19 class SubTime extends GetTime
20 {
21 
22     public void runcode()
23     {
24         
25         for(int x=0; x<4000; x++)
26         {
27             System.out.print(x);
28         }
29     }
30 }
31 
32 //主函数
33 class  TemplateDemo
34 {
35     public static void main(String[] args) 
36     {
37         //GetTime gt = new GetTime();
38         SubTime gt = new SubTime();
39         gt.getTime();
40     }
41 }