SCJP題庫第127題

Given:

1. public class Donkey2{

2.   public static void main(Stnng[] args){

3.     boolean assertsOn = true;

4.     assert(assertsOn): assertsOn = true;

5.     if(assertsOn){

6.       System.out.println("assert is on");

7.     }

8.   }

9. }

If class Donkey2 is invoked twice, the first

time without assertions enabled, and the

second time with assertions enabled, what are

the results?

A. no output

B. no output assert is on

C. assert is on

D. no output , An Assertion Error is thrown.

E. assert is on , An AssertionError is thrown.

Ans: C

解說 :

即使assert作用，4行也不會發生assertion error，assertOn是false才會發生assertion error