SCJP Brainteaser (3)

[Valentin Crettaz]

What gets printed out when the following code is compiled and run?

public class Main {
public static void main(String[] args) {
boolean x = true;
if (x = isOn()); {
System.out.println("Hello");
}
System.out.println("World");
}
 
public static boolean isOn() {
return false;
}
}

Thanks for participating Oh, and hey, try to compile mentally and not using and IDE or javac. The exercise will be much more funny that way

[Joe Harry]

Hi Above,

It prints Hello followed by world and removing the ; will print world.

Regards,
Jothi Shankar Kumar. S

[ October 31, 2006: Message edited by: Jothi Shankar Kumar Sankararaj ]
[ October 31, 2006: Message edited by: Jothi Shankar Kumar Sankararaj ]

[Tuhin Ghosh]

Hello
World

[Gareth Western]

I'd say:

Hello
World

because of the ";" you tried to hide in the line containing the "if"

[Burkhard Hassel]

It prints out

Hallo
ween!


because it's so horrible!

Bu.

[Joe Harry]

Hi Valentin,

I've become a great fan of your questions. The most interesting part is that you finish the post by giving references to places where we get a decent explanation for that particular question you post. Great job man.

Regards,
Jothi Shankar Kumar. S
[ October 31, 2006: Message edited by: Jothi Shankar Kumar Sankararaj ]

[Prahalad Deshpande]

The code will print Hello because of the semi colon after the "if". Then it will print world.

[Vivian Josh]

-------------------------------
public class Main {
public static void main(String[] args) {
boolean x = true;
if (x = isOn()); {
System.out.println("Hello");
}
System.out.println("World");
}

public static boolean isOn() {
return false;
}
}
-----------------------------------
Bcoz of the semicolon, it will print Hello and then on next line will print World .

Hello
World

[Prasanth Pillai]

Hello
World

[Valentin Crettaz]

Alright, you nailed it! Good job!

The catch here was of course the semicolon and to a lesser extent the assignment operation in the if condition.

Relevant pointers to the JLS:
14.6 The Empty Statement
15.26 Assignment Operators

Thanks to those who participated. Stay tuned...

Previous brainteasers:
SCJP Brainteaser 1
SCJP Brainteaser 2

because it's so horrible!
Burkhard, could you elaborate on that?