黑马程序员_java_for语句实例

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 for语句:

 累加思想，从1加到100：

class sum

{

     public static void main(Stinrg[] args)

         {

                 int sum=0;

                 for(int x=1;x<=100;x++)

                  {

                       sum=x+sum;

                  }

                 System.out.println(sum);

        }

}

从1~100找到，7的倍数的个数，并分别打印

这需要用到计数器

class ForDemo

{

          public static void main(String[] args)

              {

                       int count=0;

                       for(int x=1;x<=100;x++)

                       {

                              if(x%7==0) 

                                  count++;

                        }

                          System.out.println(count);

              }

}

 

嵌套for循环：

 九九乘法表
 1*1=1
 1*2=2 2*2=4

class ForForDemo

{

      public static void main(String[] args)

     {

            for(int x=1;x<=9;x++)

             {

                  for(int y=1;y<=x;y++)

                 {

                    System.out,println(Y+"*"+x=x*y+"\t")

                }

                 System.out.println();

             }         

     }

}

 

/*

打印下面图形

*

**

***

****

*****

*/

class ForForeDemo1

{

         public static void main(String[] args)

          {

                for(int x=1;x<=5;x++)

                 {

                     for(int y=1;y<=x;y++)

                    {

                           System.out.println("*");

                    }

                   System.out.println();

                 }

            }

}