Delphi 7 for Java Programmers

Comments

Comment Style Java Delphi
// comment yes yes
/* comment */ yes no
(* comment *) no yes
{ comment } no yes

Delphi convention: (* code *) vs {Textual Comment}

Procedure vs Function
Method in Java = either “function” (if it has a return value) or “procedure” (if it has no return value) in Delphi

Overloading a procedure:
In the interface section of your unit, add “overload;” at the end of both overloaded versions of the procedure.

    procedure TranslateForm(form : TTntForm); overload;
    procedure TranslateForm(form : TForm); overload;

Exceptions

Java Delphi
Try Try
Catch Except
Finally Finally
Throw Raise

In order to have both an Except and Finally block for the same line of code, you have to nest Try blocks, like this:

Try
  Try
    causeSomeRandomException();
  except
    on E:Exception do ErrorMsg(num,'Error:',E.Message,True);
  end;
finally
  doSomeCleanup();
end;

Other suggested reading:
http://techinorg.blogspot.com/2008/09/delphi-for-java-developers.html
Comments on some of the differences the author found less enjoyable

http://www.webbasedprogramming.com/Java-Developers-Reference/ch5.htm
It’s going the other way Delphi to Java, so it’ll point out areas of difference, but not the Delphi syntax.

http://www.marcocantu.com/papers/ooplang.htm
Compares C++, Java, and Object Pascal (Delphi)’s OOP Features.

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