Where to apply java codes?

Good Day:
Perhaps this sound funny....I bought a Java book to learn the coding...pretty interesting...but after all, it didn't tell where can I type and test all those codes.
After much reading, understand that it should be applied onto the JDK. Am I right? so I went to Java site and downloaded it. But nothing happened? I even borrow some other machine to install the JDK, still the same????
When I check form control panel, the JDK and JRE successfully install. Pls help. After all, I need to start on where can i test my java codes?
Many thanks for your reply.

hellbinder, my apology...i guess you and everyone
confuse with my question.
Ok, see, what I need is to type in the code as per
given in the book i bought. I understand that it got
to be typing in the JDK in order to be able to test
it out. So I download the JDK (including JRE & IDE)
and had it install on my pc. Then now, I still could
find the JDK (what I think/mean the "text editor"
here) for me to type in the java codes.
Or shall I re-phare in in suce, let's imagine, if
given with a stack of words and fonts, we type in
note pad may be. then now given with the Java codes,
where shall i type it? JDK right? thus I installed
JDK but I couldn't find or launch it to type in those
Java codes?!
Thanks!You don't "type in the java codes" in your JDK. You use a texteditor to "type in the java codes" and compile "the java codes" with the compiler from your JDK, and after that you run "the java (byte)codes" with the JRE from your JDK.
Everything is explained step-by-step in the tutorial I posted earlier. Please take the time to follow those steps.

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Where to put java code - Best Practice

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Edited by: Stuart Fleming on May 20, 2012 5:25 AM
Edited by: Stuart Fleming on May 20, 2012 5:27 AM

First point here is when you say "where to put the java code" and you're referring to ADF BC, the point is you put "business logic java code" in the ADF Business Components. It's fine of course to have Java code in the ViewController layer that deals with the UI layer. Just don't put business logic in the UI layer, and don't put UI logic in the model layer. In your 2 examples you seem to be considering the ADF BC layer only, so I'll assume you mean business logic java code only.
Meanwhile I'm not keen on the term best practice as people follow best practices without thinking, typically best practices come with conditions and people forget to apply them. Luckily you're not doing that here as you've thought through the pros and cons of each (nice work).
Anyway, back on topic and off my soap box, as for where to put your code, my thoughts:
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I am a java beginner. i need to know which interface i can use to write java code

Hi ,
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John,
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$input = sha1("MehmetKaraman");
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Try Changing your namespace for java to ConvertDate2(This class should be in classpath) and replace
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with
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Make sure your query matches with ds_start_date correctly.

Where to apply java codes?

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