[Java lista] SCJP vizsga

[Jozsef Tabanyi]

Csak egy pelda a szivatos kerdesekre:

 Given:


 1.  enum Days {MONDAY, TUESDAY, WEDNESDAY}
 2.
 3.  class Test {
 4.    public static void main(String [] args) {
 5.      int x = 0;
 6.      Days d = Days.TUESDAY;
 7.      switch(d) {
 8.        case MONDAY: x++;
 9.        case TUESDAY: x = x + 10;
10.        case WEDNESDAY: x = x + 100;
11.        case THURSDAY: x = x + 1000;
12.      }
13.      System.out.println("x = " + x);
14.    }
15.  }


What is the result?


A
	x = 10
B
	x = 110
C
	x = 1110
D
	Compilation fails.
E
	An exception is thrown at runtime.


















Option D is correct.
Compilation fails because THURSDAY was never enumerated.
It is valid to use a correctly defined and referenced enum in a switch.

joco

Jozsef Tabanyi
mailto:jozsef at tabanyi.hu
http://www.tabanyi.hu