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JAVA基础(五)

慕晨sekurlsa 发布时间：2021-12-20 19:39:42 ，浏览量：7

一、目录

switch分支细节
for循环控制
do…while循环细节
break细节

二、switch分支细节

表达式数据类型，应和case后的常量类型一致，或者是可以自动转成可以相互比较的类型，比如输入的是字符，而常量是int
switch(表达式)中表达式的返回值必须是：(byte,short,int,char,enum,string)
case子句中的值必须是常量，而不能是变量
default子句是可选的，当没有匹配的case时，执行default
break语句用来在执行完一个case分支后使程序跳出switch语句块；如果没有写break，程序会顺序执行到switch结尾，除非遇到break

三、for循环控制

循环条件是返回一个布尔值的表达式
for(;循环判断条件;)中的初始化和变量迭代可以写到其他地方，但是两边的分号不能省略

	int i = 1;
	for(; i


    
        
            
                
                
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