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Easy Learn Java: Programming Articles, Examples and Tips - Page 24


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Question: Why do not distinguish methods based on their return value?

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Q: Why Java do not distinguish methods based on their return value?

Only on class names and arguments list?

I think, it could be obvious from declaration:

void aa(){}
int aa(){}
to use it later in a such way:
int bbb = aa();
compiler could easily distinguish which function must be used here - int, not void...

Answer: Yes, in this situation compiler easily will find out which kind of function must be used.

But quite often a method can be called directly - just to do something, not to return some value. The return value is not important here:


...
aa();
...

In this case compiler can not find out which method must be used. And other programmer reading your program will be confused as well.


197 bytes more | 41 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, February 25, 2003 (00:00:00) (4530 reads)

Question: Is it new Java feature that my class has no constructor?

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Question: My Java class has no constructor!!!? Is it new Java feature, like generics?

I read that Java creates a default constructor for every class if I do not do it myself -default one, without arguments.

I wrote small program where I defined my constructor with two arguments. But in another place I still need an empty constructor (without arguments).

And my compiler complains that it can not find it!

Answer: Java creates a default constructor if you have no constructors at all.

If you create even one with arguments a default constructor will not be created and it is your responsibility to add it into a program.



25 comments | Printer Friendly Page  Send to a Friend | Score: 3
Posted by jalex on Monday, February 24, 2003 (00:00:00) (5389 reads)

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