A JSP scripting element that declares methods, variables, or both in a JSP page.

In advanced Java, a JSP (JavaServer Pages) declaration is used to declare variables and methods that can be used later in the JSP file. The declaration block in JSP is enclosed between <%! and %> tags.

Here is an example of a JSP declaration:

jsp

<%!

int myVariable = 10;

public void myMethod() {
// some code here
}
%>

In this example, myVariable is a declared variable, and myMethod is a declared method. These declarations are typically used to define reusable code or variables that can be accessed within the JSP file. The declared variables and methods are placed outside the HTML content and are available throughout the entire JSP page.

It’s important to note that the use of declarations in JSP is not as common as other elements like scriptlets or expressions, and it’s generally recommended to use JavaBeans or other MVC (Model-View-Controller) design patterns for better separation of concerns in web applications.