模板方法模式

 1 //模板方法模式
 2 abstract class time{
 3     public final void getTime() {//不让复写
 4         long start = System.currentTimeMillis();
 5 
 6         runcode();
 7 
 8         long end = System.currentTimeMillis();
 9         System.out.println("毫秒" + (end - start));
10     }
11 
12     public abstract void runcode();
13 }
14 
15 class Elem extends time{
16     public void runcode() {
17         for (int i = 0; i < 1000; i++) {
18             System.out.println(i);
19         }
20     }
21 }
22 
23 public class CurrentTime {
24     public static void main(String[] args) {
25         // GetTime gt = new GetTime();
26         Elem gt = new Elem();
27         gt.getTime();
28     }
29 }
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