Java中的流程控制

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Java学习入门——流程控制

流程控制

流程控制语句是用来控制程序中各语句执行顺序的语句，可以把语句组合成能完成一定功能的小逻辑模块。

其流程控制方式采用结构化程序设计中规定的三种基本流程结构，即:

➢顺序结构

程序从上到下逐行执行，中间没有任何的判断和跳转。

➢分支结构

①根据条件，选择性的执行某段代码

②有if-else和Switch-case两种分支语句

➢循环结构

①根据循环条件重复性的执行某段代码

②有while、do-while、for三种循环语句

③JDK1.5提供了foreach循环，方便的游历集合，数组元素。

A flow control statement is a statement used to control the execution order of each statement in a program. The statement can be combined into a small logic module that can complete a certain function.

Its process control method adopts three basic process structures specified in structured programming, namely:

➢Sequence structure

The program is executed line by line from top to bottom, without any judgment or jump in the middle.

➢Branch structure

① According to the conditions, selectively execute a certain piece of code

②There are two branch statements: if-else and Switch-case

➢Circular structure

① Repeatedly execute a certain piece of code according to the loop condition

②There are three kinds of loop statements: while, do-while, and for

③JDK1.5 provides a foreach loop, which is convenient to travel through collections and array elements.

分支结构中的------if-else循环

三种结构

if语句三种格式

第一种

if(条件表达式){

执行代码块；

}

if-else loop in branch structure

three structures

The first

Three forms of if statement

if(conditional expression){

execute code block;

}

第二种

if（条件表达式）{

执行代码块1；

}

else {

执行代码块2；

}

the second

if(conditional expression) {

execute code block 1;

}

else {

execute code block 2;

}

第三种：多选一

if（条件表达式）{

执行表达式1；

}else if（条件表达式）{

执行表达式2；

}else if（条件表达式）{

执行表达式3；

}

...

else{

执行表达式n；

}

The third type: multiple choice

if(conditional expression) {

execute expression 1;

}else if(conditional expression){

execute expression 2;

}else if(conditional expression){

execute expression 3;

}

...

else{

execute expression n;

}

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