Interface in JSP
In interface none of its methods are implemented. All the methods are abstract. There is no code associated with an interface. In an interface all the instance methods are public and abstract. Interfaces are always implemented in the class. They provide extra behaviors to the class.
In this example we are going to make use of interface in our jsp application.
The code of the program is given below:
<html>
<head>
<title>Creating a Java Interface</title>
</head>
<body>
<h1>Creating a Java Interface</h1>
<%!
javax.servlet.jsp.JspWriter jw;
interface Add
{
int add() throws java.io.IOException;
}
class Addition implements Add
{
int a = 10;
int b = 20;
public int add() throws java.io.IOException
{
jw.println("The addition of " + a + " and "
+ b + " is equal to ");
return (a+b);
}
}
%>
<%
jw = out;
Addition addition = new Addition();
int a = addition.add();
out.println(a);
%>
</body>
</html>
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The output of the program is given below:
