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 }