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Comments (Java and Delphi Cross Reference Guide)

By Mike Prestwood

Java versus Delphi: A side by side comparison between Java and Delphi.

Language Basics

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.

Comments

[Other Languages]

Languages Focus

Commenting code generally has three purposes: to document your code, for psuedo coding prior to coding, and to embed compiler directives. Most languages support both a single line comment and a multiple line comment. Some languages also use comments to give instructions to the compiler or interpreter.

Java: // or /* ... */

Commenting Code
Java uses "//" for a single line comment and /* */ for a multiple line comment.

Syntax Example:

//Single line comment in MS (not ANSI compliant so do NOT use).
/* ANSI compliant single line comment. */
/*
Multiple line
comment.

*/

/*

* This is another popular way

* to write multi-line comments.

*/

Delphi: // or { ... } or (* ... *)

Commenting Code
Delphi uses // for a single line comment and both {} and (**) for multiple line comments. Although you can nest different types of multiple line comments, it is recommended that you don't.

Compiler Directives - $
A special comment. Delphi compiler directives are in the form of {$DIRECTIVE}. Of interest for comments is using the $IFDEF compiler directive to remark out code.

Syntax Example:

//This is a single line comment.

Multiple line

comment.

 
(*
This too is a
multiple line comment.
*)

 
{$IFDEF TEMPOUT}
  //...code here
{$ENDIF}

Delphi Comments (// or { ... } or (* ... *)) 2 certification questions.