Dan' s Question !

[Vinod Sinha]

Question 5
class MWC105 {
static boolean b1;
public static void main(String[] args) {
boolean[] array = new boolean[1];
boolean b2;
System.out.print(b1+",");
System.out.print(array[0]+",");
System.out.print(b2);
}}
What is the result of attempting to compile and run the program?
a. Prints: true,true,true
b. Prints: false,false,false
c. Prints: null,null,null
d. Prints: false,true,false
e. Compile-time error
f. Run-time error
g. None of the above
The answer should be (f) but it is given as (e) ?

[Harwinder Bhatia]

Hi Vinod
The answer is infact (e).
This is what I got when I 'tried' to compile it:

variable b2 might not have been initialized
System.out.println (b2);
                    ^

Please remember that local variables are not automatically initialized and have to initialized explicitly before being used in expressions. But elements in an array (local or otherwise) are initialized automatically if not explicitly initialized.
Thanks
Harwinder
[ October 19, 2003: Message edited by: Harwinder Bhatia ]

[Doug Dunn]

Here is the actual compiler error:
Test.java:8: variable b2 might not have been initialized
System.out.print(b2);
^
1 error
This is a simple definite assignment problem