(New Question Bottom-Posted ..)
RE: JavaIntro: JavaControl, Lab-1034, Exercise 2: For Loop
[code]
//=========================
// Search the String array using for loop.
// * The "names.length" is the size of the array.
// * This for loop compares the value of each entry of the
array with
// the value of searchString String type variable.
// * The equals(..) is a method of String class. Think about
why you
// cannot use "names[i] == searchName" as comparison logic
here.
for (int i=0; i<names.length; i++){
if (names [i ].equals(searchName)){
foundName =true;
break;
}
}
// =========================
[/code]
> -------------------------------------
> Date: Wed, 29 Aug 2007 09:57:05 +0530
> Local: Tues, Aug 28 2007 11:27 pm
> Subject: Re: [java programming] Re: LAB-1034:Controls Homework Solution
>
> By the way, why cant we use == operator to compare strings instead
of method "equals"?
>
> I ran the following code in main and it indicates that theres no
problem using == operator.
>> -------------------------------------
>> Date: Tue, 28 Aug 2007 23:44:50 -0500
>> Local: Tues, Aug 28 2007 11:44 pm
>> Subject: Re: [java programming] Re: LAB-1034:Controls Homework Solution
>>
>> You don't want to use '==' for String compares. Here is an article
>> that explains why:
>>
>> http://www.javaworld.com/javaqa/2002-09/01-qa-0906-strings.html
>>
>> Kirby
QUESTION 1:
- So JAVA string comparisions must be done using:
if (names[i].equals(searchName) )
- IIRC, in C++ you CAN do STRING comparisons using:
if (names[i] == searchName )
As each will return the VALUE the object-address pointed to, not the
object-address as in Java (according to article linked above).
- In C++ to compare the objects it would be something similar to:
if ( &names[i] == &searchName )
- So in JAVA, could we alternatively do the same STRING comparison using
"==" along with some kind of deference operator? ie.
if (names[i->value] == searchName->value )
I suppose this is less elegant here, but I'm more interested in grasping
how JAVA is accessing memory/objects/etc. compared to C++.
Thanks,
Steven
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