public static void main(String[] args) {

int a = 10;

int b = 20;

//定义变量，保存a和b的较大值

int c;

if(a > b) {

c = a;

} else {

c = b;

}

//可以上述功能改写为三元运算符形式

c = a > b ? a:b;

}

switch(表达式) {

case 常量值1:

语句体1;

break;

case 常量值2:

语句体2;

break;

...

default:

语句体n+1;

break;

}

public static void main(String[] args) {

//定义变量，判断是星期几

int weekday = 6;

//switch语句实现选择

switch(weekday) {

case 1:

System.out.println("星期一");

break;

case 2:

System.out.println("星期二");

break;

case 3:

System.out.println("星期三");

break;

case 4:

System.out.println("星期四");

break;

case 5:

System.out.println("星期五");

break;

case 6:

System.out.println("星期六");

break;

case 7:

System.out.println("星期日");

break;

default:

System.out.println("你输入的数字有误");

break;

}

}