is it a valid JSP expression

trupti nigam

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posted 21 years ago

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<%= -2%>
Is it a valid JSP expression??
Thanks,
Trupti

Kamal Kishore

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posted 21 years ago

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Yes ! This is similar to
<%out.println(-2);%>
Kamal

trupti nigam

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posted 21 years ago

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This is the mock exam question from the jweb+.
They have given this as the wrong answer.
The other correct answers are
<%= 2+3%>
<%= "2"+"3"%>
Thanks,
Trupti

Parag K

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posted 21 years ago

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Hi
I couldnt understand why this should be wrong. The JSP Specification clearly states that the Expression is converted to the java statement. (JSP.6.4.3), stated here for ready reference,
------------------------------------------------
JSP.6.4.3 Expressions
An expression is transformed into a Java statement to insert the value of the expression, converted to java.lang.String if needed, into the stream curnamed by the implicit variable out. No additional newlines or space is included.
Ignoring quotation and performance issues, this corresponds to a statement of the form:
Original Equivalent Text
-------------------------------------------------
<%= expression %> out.print(expression)

Maha Annadurai

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posted 21 years ago

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Made a test with a test.jsp having following code with Tomcat 4.0 and I did get -2 pinted out.
<html><body>
Value is <%= -2 %>
</body></html>
Regards,
Maha Anna
[ November 24, 2002: Message edited by: Maha Annadurai ]

Timber Lee

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Posts: 157

posted 21 years ago