Is there anything developed in java 4 and not run in java 5?

Hi all,
Is there anything of java 4 doesn't work correctly in java 5? and is there any document said about it?

Hi Yen,

Don't think this is the appropriate forum to ask such a question, because for the SCJD you have to use jdk 1.5 or jdk 1.6. So the 1.4 is out of the question.

As far as i know there is nothing from Java 1.4 that won't run in java 1.5. The only thing you have to watch out for (and i can think of) is this code:

because the enum is a java keyword since java 1.5

Kind regards,
Roel

Sorry about my mistake. Also thanks for your answer

Generics won't run.

I think the enhanced "for" loop is new to 5, also. I think you have to use Java 6 at this point, to be quite honest. Fortunately 6 didn't introduce too many new changes. 5 was huge, however and I strongly suggest to yen to do some research on Java 5

Hi all,

I think his question was: can you write code in Java 1.4 that won't run in Java 1.5, not the other way around (of course generics and the enhanced for-loop won't compile in Java 1.4)

Kind regards,
Roel

Roel De Nijs wrote:Hi all,

I think his question was: can you write code in Java 1.4 that won't run in Java 1.5, not the other way around (of course generics and the enhanced for-loop won't compile in Java 1.4)

Kind regards,
Roel

I can't agree any more with you

I can't think of anything in J2SE that fits into that category. The closest thing would be that before 1.4 "assert" could be a variable name, and starting with 1.4 it's tricky to use "assert" as a variable name.

Bert Bates wrote:I can't think of anything in J2SE that fits into that category. The closest thing would be that before 1.4 "assert" could be a variable name, and starting with 1.4 it's tricky to use "assert" as a variable name.

Thanks for your answer, and also your book (Sun Certificated Programmer for Java 6 study guide)

Because of it, I passed SCJP with high result!!!
Thanks so much !!!