JAVA学习--模板方法设计模式

 1 public class TestTemplate {
 2     public static void main(String[] args) {
 3         new SubTemplate().spendTime();
 4     }
 5 }
 6 
 7 abstract class Template {
 8 
 9     public abstract void code();
10 
11     public void spendTime() {
12         long start = System.currentTimeMillis();
13 
14         this.code();
15 
16         long end = System.currentTimeMillis();
17         System.out.println("花费的时间为：" + (end - start));
18     }
19 }
20 
21 class SubTemplate extends Template {
22     
23     public void code() {
24         boolean flag = false;
25         for(int i = 2;i <= 10000;i++){
26             for(int j = 2;j <= Math.sqrt(i);j++){
27                 if(i % j == 0){
28                     flag = true;
29                     break;
30                 }
31             }
32             if(!flag){
33                 System.out.println(i);
34             }
35             flag = false;
36         }
37     }
38 }