Lunch In Milan - Java

If you take a close look at the last-but-one example above, you'll notice that the conditional expression

(temp < 25 && temp > 10)

is slightly different from the ones you've been used to thus far. This is because JSP also allows you to combine multiple conditions into a single expression, with the help of an animal called a "logical operator".

The following table should make this clearer.

Assume delta = 12, gamma = 12 and omega = 9

Operator	What It Means	Example	Evaluates To
&&	AND	delta == gamma && delta > omega	delta equals gamma AND delta is greater than omega
True &&	AND	delta == gamma && delta < omega	delta equals gamma AND delta is less than omega
False ||	OR	delta == gamma || delta < omega	delta equals gamma OR delta is less than omega
True ||	OR	delta > gamma || delta < omega	delta is greater than gamma OR delta is less than omega
False !	NOT	!delta	delta doesn't exist

So, instead of something as ugly as this

<%
if (day == "Thursday")
{
if (time == "12")
{
if (place == "Italy")
{
lunch = "pasta";
}
}
}
%>

you could have something as elegant as this.

<%
if (day == "Thursday" && time == "12" && place == "Italy")
{
lunch = "pasta";
}
%>

>>> More Java & J2EE Articles          >>> More By Vikram Vaswani and Harish Kamath, (c) Melonfire

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