【点记】初学switch语句的错误

 1 public class Example {
 2        public static void main(String[] args) {
 3               int val = 1;
 4               switch (val) {
 5               case 1:
 6                      System.out.println("P");
 7               case 2:
 8               case 3:
 9                      System.out.println("Q");
10                      break;
11               case 4:
12                      System.out.println("R");
13                      default: System.out.println("S");
14               }
15        }
16 }