Passing Arrays In Jsp Methods
Array is a collection of similar data type. It
is one of the simplest data structures. Arrays holds equally sized data
elements generally of the similar data type. In an array the index starts from
0. Some arrays can be multidimensional. One and two- dimensional arrays are most
commonly used arrays in java. JSP is a technology which enables us to mix html
static component with the dynamically generated contents from servlets. In this
jsp example we are going to make a program on Arrays. In this example we will
mix the html content i.e. static in nature, when this static content mix
with the dynamic contents of jsp by using directive the page will become
dynamic.
In this example of jsp for passing arrays in Jsp
methods, first make a method named Addition(int[] a) of type void which
will take an array of type int as its input, it will add the array elements by
2. This method is declared inside the declaration directive. Anything which will
declared inside the declaration directive i.e. <%! ----------%> its
scope will be applicable in the whole class. Now declare an array of type int
inside the scriptlet directive and pass a value in the array. The
logic of the program is written inside the scriptlet directive. This directive
is executed each time whenever the request comes for this jsp page. This
tag will be written inside a _jspservice() of HttpJspPage class
when the jsp is translated into servlet. Now call the method Addition()
inside the scriptlet directive so that the method can be executed and the result
will be displayed to the user. To display the output call the implicit object
out, which is responsible for displaying the content to the browser. At last
save this page as Passing-Arrays-Methods.jsp.
Code of the program is given below:
<HTML>
<HEAD>
<TITLE>Passing Arrays In Jsp Methods</TITLE>
</HEAD>
<BODY>
<table border="1" cellpadding="0" cellspacing="0" width="60%" align="center">
<tr><td>
<font size="6" color ="#000080">Passing Arrays In Jsp Methods</font><br>
<%!
void Addition(int [] a)
{
for (int i = 0; i < a.length;i++) {
a[ i ] += 2;
}
}
%>
</td></tr>
<tr><td>
<%
int array[] = {2, 4 , 3, 6, 8};
out.println("Before the call to Addition...<BR>");
for (int i = 0; i < array.length; i++) {
out.println("array[" + i + "] = " + array[i] + "<BR>");
}
Addition(array);
out.println("After the call to Addition...<BR>");
for (int i = 0; i < array.length; i++) {
out.println("array[" + i + "] = " +
array[i] + "<BR>");
}
%></td>
</tr>
</table>
</BODY>
</HTML>
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The output of the program is given below:
Download this example.
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