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how is this answear correct?

 
Greenhorn
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Question found in one of the mock exam?
1. class MyClass {
2. public float getNum() {
3. return 1.2f;
4. }
5. }
6. public class YourClass {
7. public ______ getNum() {
8. return 3;
9. }
10. }
What should be entered in the blank on line 7 that will allow compilation to succeed?
CORRECT ANSWEAR GIVEN IS "float".
but i feel it is "int"
What do u feel?
 
Ranch Hand
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Yes, i also thimk its an int.
I don't find any reason for it to be float, becuse the 2 classes r not related in any way.
 
Ranch Hand
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Hi umesh,
'float' and 'int' would both work; although, based on the returned value an 'int' makes more sense.
------------------
Jane Griscti
Sun Certified Programmer for the Java� 2 Platform
 
Ranch Hand
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My first thought was "int" as well.
However, the ONLY possible reason which it MIGHT be "float" is that it's attempting to override the getNum() function but since it doesn't mention any of this, my first instinct would still have been "int"
 
mister krabs
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short and byte will work, too.
 
Ranch Hand
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As the method "return 3", how can it be other than byte, short, or int??
--Farooq
 
Ranch Hand
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I dunno but it can. The system makes a cast to 3.0!
can anyone explain this?
 
Jane Griscti
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Hi SynIt Master,
Your right, widening conversion comes into play, they system will just convert the '3' to '3.0f'.
Looking at the question again, it's not quite clear what's being tested At first I thought it was related to overriding, in which case the return value must be the same but YourClass does not extend MyClass. I'm not sure where the question came from but all in all IMHO it seems a rather pointless one

------------------
Jane Griscti
Sun Certified Programmer for the Java� 2 Platform
 
Jane Griscti
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SynIt Master,
Please read the JavaRanch Name Policy and re-register using a name that complies with the rules.
Thanks for your cooperation.
------------------
Jane Griscti
Sun Certified Programmer for the Java� 2 Platform
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