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Regain the basics of Java (3): Summary of process control

Jan 16, 2017 am 09:21 AM

Regain the basics of java (3): Summary of process control

1. Sequential structure

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Java语言中的基本且默认的顺序结构。

  其特点为:从上到下,从左到右,有()先运算()内部的运算。

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2. Conditional structure:

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If: if(条件语句){

                   满足条件的语句;

                  }

if-elseif(条件语句){

                     满足条件的语句;

                    }else {

                          不满足if条件情况下,则执行该语句,

                         }

         if(条件语句1){

                     满足条件的语句;

                      }else  if(条件语句2)

                      {

                          不满足if条件语句1的情况下,则执行该语句,

                       }else  if(条件语句3)

                      {

                         不满足if条件语句1和条件语句2情况下,则执行该语句,

                       }…………

多重ifif(条件语句1){

                       If(条件语句2){

                                      If(条件语句3){

                                                      ……}

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3. Selection structure: switch

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Switch(条件变量){

                       Case(条件变量的值1):满足条件下要执行的语句;

                          break

                       Case(条件变量的值2):满足条件下要执行的语句;

                          break;                           

                       Case(条件变量的值3):满足条件下要执行的语句;

                          break

                       ……

                       Default    无变量值的条件下执行语句;

                        }

   注意:1、Switch只能执行简单的变量类型:byte 、short、int、char、string

         2、switch具有穿透性,如果case1后没有break则继续执行case2

         3、switch运行在遇到break后停止,没有break寻找default,如果没有

            Default    则则switch代码结束。且该switch程序无作用。

        1.case 的值不能重复

        2.case的顺序没有要求。

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4. Loop structure: for:

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for(数据初始化;条件变量;循环变量){

                    循环体

                   }

循环嵌套

循环结构:

    forwhiledo-while

    解决重复性操作问题而出现的程序结构。

    组成:

        1.循环体:重复的东西

        2.初始化语句:循环执行之前的准备工作。

        3.条件判断语句:判断循环是否继续执行下去。

        4.循环变化语句:每次循环之后,用来记录循环的那个东西的变化。

    for循环:

        for(初始化语句;条件判断语句;循环变化语句){

            //循环体

        

        1.先执行初始化语句

        2.执行条件判断语句(条件判断语句结果必须是boolean类型)

            如果结果为true,则执行循环体

            如果结果为false,则循环结束。

        3.执行循环体

        4.循环变化语句

        5.执行条件判断语句(转到了第2步)

        for(int a= 0;a<100;a++){

           //循环操作

        }

循环嵌套:

   for(int a= 0;a<100;a++){

     for(int b= 0;b<100;b++){

           //循环操作

        }

   }

   1.循环嵌套时,循环变量不能重复。

   2.先执行外层循环,然后在执行内层循环。

        每执行外层循环一次,则内层循环都会执行一遍。

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