Varibles in Delphi

Posted on 2000-03-31
Medium Priority
Last Modified: 2010-04-04
Hellofrom java i have started learning delphi.
In java i use varibles like this :
t = Text.getText();

so then i could do things like text.setText(t);

How do i do this in delphi?
Question by:dvd99

Expert Comment

ID: 2674759

I'm not sure what you want to do:

if you want to assign a value to a variable, then use:

number:=12345 (if number is an integer)
text:='hello' (if text is a string)

if you want to get the value of a variable, then you simple use something like this: showmessage('your text is:'+text);...that gives you a messagebox with the value of the text-variable.

hope this helps


Expert Comment

ID: 2674760
What kind of class is "Text" ?
LVL 15

Accepted Solution

simonet earned 200 total points
ID: 2675132

In Java, strings (aka TEXT) are wrapped in a class, and everytime you want to handle a string, you have to resort to that class.

In Delphi, things are a bit different. There's no class STRING or TEXT. String, in Delphi, is a TYPE, just like an integer, real/float, etc. Therefore, functions can handle it directly, and operators also apply to handling string.

Below are some example of applying functions and operators to a string type variable:

in Java:
t = Text.getText();

in Delphi:
simply declare the variable of type strig in the VAR section of the unit/function:

  s : string;


in Java:

in Delphi:
use direct assignment:

t := 'any text you want';
t := s; { s is another string variable }

Other examples (using string-handling procedures/functions):

t := 'Hello world!';
S := Copy(t, 7, 2);  { copies 2 chars from T into S, starting at pos 7 }

SetLength(T, 5); { truncates T to 5 chars ('Hello' in this case) }

The Delphi help files cover this issue thouroughly, and I strongly advise you to read some of it (the topic is called "String handling routines").

I also would like to suggest a couple books:
"Delphi 5 Unleashed", by Charlie Calvert
"Delphi 5 Developers Guide", by Steve Texeira and Xavier Pacheco

both books are published by Sams Publishing.

There aren't many similarities between Delphi and Java when string varibles are concerned. You can, however, use all the knowledge you've acquired with Java on OOP, and apply that knowledge to Delphi.




Author Comment

ID: 2676776
Thanks guys you both helped heaps!!

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
The video provides a quick and easy steps to migrate MBOX file to well known Outlook PST and Office 365. Besides this, it also supports and migrates more than 20 email clients of MBOX which include AppleMail, Opera, Thunderbird and SeaMonkey effortl…
Through the video, you can check the migration process of Outlook PST file to PDF. Kernel for Outlook to PDF tool can convert Outlook emails with all attributes like Subject, To, From, Cc, Bcc and other folders such as Inbox, Outbox, Sent Items, Jun…

622 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question