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Java Interview Questions

What are JSP scripting elements?

JSP scripting elements are used to create and access objects, define methods, and manage the flow of control. Since one of the goals of JSP technology is to separate static template data from the code needed to dynamically generate content, very sparing use of JSP scripting is recommended.

Declarations, Scriptlets, Expressions

What is JSP Declarations?

A JSP declaration is used to declare variables and methods in a page's scripting language. The syntax for a declaration is as follows:

<%! scripting language declaration %>

What is Scriptlets?

A JSP scriptlet is used to contain any code fragment that is valid for the scripting language used in a page. The syntax for a scriptlet is as follows:

<% scripting language statements %>

What is Expression?

A JSP expression is used to insert the value of a scripting language expression, converted into a string, into the data stream returned to the client. When the scripting language is the Java programming language, an expression is transformed into a statement that converts the value of the expression into a String object and inserts it into the implicit out object.

The syntax for an expression is as follows:

<%= scripting language expression %>

Note that a semicolon is not allowed within a JSP expression.