Sorry, but you are incorrect. == is always identity.
The only reason your example works is because constant Strings are interned
during compile time.
Scott
> -----Original Message-----
> From: A mailing list about Java Server Pages specification and reference
> [mailto:[EMAIL PROTECTED]]On Behalf Of Denis Jaccard
> Sent: Friday, August 27, 1999 3:52 PM
> To: [EMAIL PROTECTED]
> Subject: Re: JSP Form
>
>
> Hi,
>
> Please stop all these mistakes ;-).
>
> In the "heart" of Java, the == operator has been overloaded (since I
> speak French, I'm not sure this is the right term) for a few classes of
> the java.lang package. String, like Integer, Double and other wrapping
> classes, belongs to these classes. Though, the == operator and the
> equals method do the same thing : it compares the content of the String
> instance.
>
> Sample :
>
> String str1="Hello";
> String str2="Hello";
> if(str1==str2) {
> System.out.println("str1==str2");
> }
> if(str1.equals(str2)) {
> System.out.println("str1.equals(str2))");
> }
>
> The two "if conditions" are true although the two String objects are
> located into two different memory addresses.
>
> I hope this clarifies the way String works. Be careful, it's not the
> same for StringBuffer. For StringBuffer, Bruce, Vance, Craig and others
> are right.
>
> --
> Denis Jaccard ([EMAIL PROTECTED])
> Java Developer & Trainer - Java Certified Programmer
>
> -------
> Open your windows to Java
> -------
>
> Adenia Software
> Tel. : +41 (0)32 724 96 57
> http://www.adenia.com
>
>
>
> Chris Mcgarel wrote:
> >
> > Can someone expalin to a novice why I must use:
> > if (Request.Form("myFormElement").equals("myString"))
> > rather than a straight comparison operator:
> > if (Request.Form("myFormElement")=="myString")
> > ?
> >
> > The latter does not work for me even though both left and right
> sides of the
> > statement are Strings.
> >
> > The full code for form.jsp is:
> >
> > <body>ody bgcolor=darkblue text=white>
> > <font face=arial>
> > <%
> > String myTest = "";
> >
> > myTest = Request.Form("mySubmit");
> >
> > if (myTest=="Click") // doesn't
> work, must be if
> > (myTest.equals("Click"))
> > {
> > out.println ("CLICKED!!!");
> > }
> >
> > %>
> >
> > <form action="form.jsp">
> > <input type=submit name="mySubmit" value="Click">
> > </form>
> >
> > </font>
> > </body>
> >
> >
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> > FAQs on JSP can be found at:
> > http://java.sun.com/products/jsp/faq.html
> > http://www.esperanto.org.nz/jsp/jspfaq.html
>
> ==================================================================
> =========
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
> JSP-INTEREST".
> FAQs on JSP can be found at:
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
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