package com.jsample;

 public class Nines {

     public static void main(String[] args){

         for(int dex = 1;dex <= 200; dex++){

             int multiple = 9 * dex;

             System.out.println(multiple + " ");

         }

         System.out.println();

     }

 }

 package com.jsample;

 public class Benchmark {//声明Benchmark类

     public static void main(String[] args){//开始程序的main()块

         long startTime = System.currentTimeMillis();//创建变量startTime,并用当前时间（毫秒值）为其赋初值

         long endTime = startTime + 60000;//创建endTime变量，与startTime正好相隔一分钟

         long index = 0;//创建循环变量index

         while (true){//无限循环，只能用break破除

             double x = Math.sqrt(index);//计算index的平方根，存到x变量中

             long now = System.currentTimeMillis();//创建变量now，并将当前时间赋值给它

             if (now > endTime){//超过一分钟，跳出循环

                 break;

             }

             index++;//循环变量自增

         }

         System.out.println(index + " loops in one minute.");//显示其进行平方根计算的次数

     }

 }

 package com.jsample;

 public class Mod13 {

     public static void main(String[] args){

         int index = 0;

         for(int flag = 1; flag <= 400; index++){

             if(index % 13 == 0) {

                 flag++;

                 System.out.println(index + " ");

             }

         }

     }

 }