JSP Syntax (3)--declaration

js| Syntax Declaration

Declaring legitimate variables and methods in a JSP program

JSP syntax

<%! Declaration; [Declaration;] + ...%>

Example

<%! int i = 0; %>
<%! int A, b, C; %>
<%! Circle a = new Circle (2.0); %>

Describe

Declare the variables and methods that you will use in your JSP program. You must do the same, or you will make mistakes.

You can declare multiple variables and methods at once, as long as the ";" At the end of the line, of course, these statements in Java if legitimate.

When you declare a method or variable, be aware of some of the following rules:

The statement must be ";" The end (Scriptlet has the same rule, but the expression is different).
You can directly use the declared variables and methods that are included in the <% @ Page%>, and do not need to declare them again.

A declaration is valid only in one page. If you want to use a few statements for each page, it's best to write them in a separate file and include them with <%@ include%> or <jsp:include > elements.