RE: [Threedsia-dev] delete[]

[<sa...@gm...>]

On Fri, 6 Apr 2001 11:10:26 -0500, Eric Bresie said:

> > From: On Behalf Of M.H...@ja...
>  > Sent: Friday, April 06, 2001 3:09 AM
>  >
>  > Well, you can't overload any operators like '=' or '[]', BUT AFAIK you can
>  > overload '+' (the only thing you can overload !) because otherwise you
>  > couldn't do 'system.out.println ("This sucks: " + myVariable);' :-)

AFA_I_K you can't even overload the +. It's just a special case when used with
String-Expression. You can use <any String-Expression> + <any other Object>

then the Objects .toString()-Method is called and a new String is created
consisting of the First String, with the result of the Method-Call appended
(remember, Strings are immutable in Java).

>  
>  You are right about the overloading of operators...but in the instants you
>  listed "+ myVariable" I would imagine the way that is done is with some
>  typecasting into a string or object that matches the type of the given
>  existing + operation types ( object + object, string + string, etc)..so if
>  MyVariable is a class that is in someway derived from one of the existing
>  classes, then it would be able to occur.

object + object is illegal, if the first object is not a string.

The Programm

public class Test1
{
  public static void main(String args[])
  {
    String a = "a";
    String b = "b";
    Integer eins = new Integer(1);
    Integer zwei = new Integer(2);

    System.out.println(a + eins);
    System.out.println(a + b);
    System.out.println("" + eins + zwei); //ugly hack, 'cause (eins + zwei) is
illegal
  }
}

prints

a1
ab
12

>  
>  Someone correct me if I am wrong...I am trying to improve my java knowledge
>  whenever I can :-)
>  
>  Eric Bresie
>  eb...@us...

regards
Joachim Sauer

-- 
f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng.