Posted on: February 9, 2008 at 12:00 AM
EL Basic Comparisons
EL means the expression language , it makes it possible to easily access application data stored in JavaBeans components. The jsp expression language allows a page author to access a bean using simple syntax such as $(name). Before JSP 2.0, we could use only a scriptlet, JSP expression, or a custom tag to include server state in the jsp page output. Expression Language (EL) was first introduced in JSTL 1.0. EL makes it easier to integrate server side state with the presentation output.
EL expression is always written between the delimiters ${ and }. In the JSP page response, the result of expression evaluation replaces the expression and its delimiters in the template text. Within tags, expression can be used only in attribute values.
The Expression Language has the following Basic Comparisons:
< > <= >= lt gt le ge
= = != eq ne
&& and
|| or
The code of the program is given below:
| <html> <head> <title>Basic Comparisons</title> </head> <body> <h1>Basic Comparisons</h1> <hr> In EL the following comparison operators are supported: <ul> <li>Less-than (< or lt)</li> <li>Greater-than (> or gt)</li> <li>Less-than-or-equal (<= or le)</li> <li>Greater-than-or-equal (>= or ge)</li> <li>Equal (== or eq)</li> <li>Not Equal (!= or ne)</li> </ul> <blockquote> <u><b>Numeric</b></u> <code> <table border="1"> <thead> <td><b>EL Expression</b></td> <td><b>Result</b></td> </thead> <tr> <td>\${5 < 7}</td> <td>${5 < 7}</td> </tr> <tr> <td>\${5 lt 7}</td> <td>${5 lt 7}</td> </tr> <tr> <td>\${4 > (6/2)}</td> <td>${4 > (6/2)}</td> </tr> <tr> <td>\${4 > (6/2)}</td> <td>${4 > (6/2)}</td> </tr> <tr> <td>\${6.0 >= 3}</td> <td>${6.0 >= 3}</td> </tr> <tr> <td>\${6.0 ge 3}</td> <td>${6.0 ge 3}</td> </tr> <tr> <td>\${4 <= 3}</td> <td>${4 <= 3}</td> </tr> <tr> <td>\${4 le 3}</td> <td>${4 le 3}</td> </tr> <tr> <td>\${2.0 == 2}</td> <td>${2.0 == 2}</td> </tr> <tr> <td>\${2.0 eq 2}</td> <td>${2.0 eq 2}</td> </tr> <tr> <td>\${(10*10) != 100}</td> <td>${(10*10) != 100}</td> </tr> <tr> <td>\${(10*10) ne 100}</td> <td>${(10*10) ne 100}</td> </tr> </table> </code> </blockquote> </body> </html> |
The output of the program is given below:
- JSP Simple Examples
- Using Abstract Class
- Applet In Jsp
- Break Statement in JSP
- Finding a Factorial using while loop
- Finding a Factorial using while loop
- Calculate factorial Using Recursion
- ArrayIndexOutOfBoundsException
- Convert Celsius to Fahrenheit
- Using Password Controls
- Password Controls
- Comments in Jsp
- Complex Java Beans Using El
- EL and complex JavaBeans1
- EL and Complex Java Beans
- Conditional Test
- Implementing Conditional Content on a JSP Page
- This is Conditional Forward using EL
- Conditional Forward using EL
- Continue statement in jsp
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