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public class Jb09_SwitchDemo
{
public static void main(String[] args)
// 选择结构：Switch
/*
switch (表达式)
case 取值1:
执行语句;
break;
case 取值2:
执行语句2;
......
default:
}
*/
//根据输入数字，输出对应季节
int month = 3;
switch (month)
case 3:
case 4:
case 5:
System.out.println("是春季");
System.out.println("没有对应的季节");
break; //此处break可省略
if与switch的应用场景：
if:
1、对具体的值进行判断
2、对区间判断
3、对运算结果是boolean类型的表达式进行判断
switch：
2、值的个数是固定的，对于只有几个固定的数值进行判断，建议用switch，效率更高。
