1 switch (表达式){
 2     case 目标值1:
 3         执行语句1
 4         break;
 5     case 目标值2:
 6         执行语句2
 7         break;
 8     ．．．．．．
 9     case 目标值n:
10         执行语句n
11         break;
12     default:
13         执行语句n+1
14         break;
15 }

 1 public class SwitchDemo01 {
 2     public static void main(String[] args) {
 3         int week = 5;
 4         switch (week) {
 5         case 1:
 6             System.out.println("星期一");
 7             break;
 8         case 2:
 9             System.out.println("星期二");
10             break;
11         case 3:
12             System.out.println("星期三");
13             break;
14         case 4:
15             System.out.println("星期四");
16             break;
17         case 5:
18             System.out.println("星期五");
19             break;
20         case 6:
21             System.out.println("星期六");
22             break;
23         case 7:
24             System.out.println("星期天");
25             break;
26         default:
27             System.out.println("输入的数字不正确...");
28             break;
29         }
30     }
31 }

 1 public class SwitchDemo02 {
 2     public static void main(String[] args) {
 3         int week = 2;
 4         switch (week) {
 5         case 1:
 6         case 2:
 7         case 3:
 8         case 4:
 9         case 5:
10             // 当 week 满足值 1、2、3、4、5 中任意一个时，处理方式相同
11             System.out.println("今天是工作日");
12             break;
13         case 6:
14         case 7:
15             // 当 week 满足值 6、7 中任意一个时，处理方式相同
16             System.out.println("今天是休息日");
17             break;
18         }
19     }
20 }