When to use keyword "const"? Just a reserved word.

[Sam Sunamin]

I found java has keyword "const". I found an example as following

    void f()
    {
        Object              o = new Object();
        final Object        fo = new Object();
        const Object        co = new Object();
        final const Object  fco = new Object();
        ...
    }

How come final and const can be used together?

What's the different between final and const, and final static?


Thank you in advance.

The code is from some website and I cannot remember. Don't use it and it will cause compile fail.

Remember, const is just a reserved keyword, and don't use for methods, variables or anything else.


[ April 11, 2007: Message edited by: Sam Sunamin ]
[ April 12, 2007: Message edited by: Sam Sunamin ]

[Remko Strating]

Final is implemented as a variable cannot be changed, a class cannot be subclassed or a method can't be changed.

const is just a reserved word and doesn't do anything.

[Sam Sunamin]

I found the same answer in sun java forum. Remko, you are right. We don't need to care about "const". Thank you.

[Chandra Bhatt]

Good reminder for the exam!

const does nothing, it is a keyword (but reserved not in use).
const can't be used as class/interface/enum/variable etc etc. name, hence it is reserved word.



Thanks all!
cmbhatt
[ April 11, 2007: Message edited by: Chandra Bhatt ]

[Vidya Singh]

When I type the same program in Eclipse, it give syntax error on token const. So, is const supported by Java 5

[Chandra Bhatt]

Sorry!!!

I agree with Vidya. Using const gives compile time error "illegar modifier".
The top most post caused big confusion.
Please guide us to come to the correct conclusion regarding "const".


Thanks,
cmbhatt

[marc weber]

Originally posted by Sam Sunamin:
I found java has keyword "const". I found an example as following

void f()
    {
        Object              o = new Object();
        final Object        fo = new Object();
        const Object        co = new Object();
        final const Object  fco = new Object();
        ...
}

...

Where did this "example" come from?

[Marcus Green]

The exam does not test you on the results of using Eclipse.

[Burkhard Hassel]

Marcus Green posted

The exam does not test you on the results of using Eclipse.

True, but in this case there is no difference in Eclipse's and the original compiler. Both indicate a compiler error at both occurences of "const".

Bu.

[Sam Sunamin]

Sorry to confuse your guys and I did not check the code in JDK. No, we did not use "const" in real java code.
[ April 12, 2007: Message edited by: Sam Sunamin ]