Using Abstract Classes : Class in JSP Page « JSP « Java Tutorial






  1. Java Tutorial
  2. JSP
  3. Class in JSP Page
<HTML>
    <HEAD>
        <TITLE>Using Abstract Classes</TITLE>
    </HEAD>

    <BODY>
        <H1>Using Abstract Classes</H1>

        <%!
            javax.servlet.jsp.JspWriter localOut;

            abstract class a
            {
                abstract String getText() throws java.io.IOException;

                public void printem() throws java.io.IOException 
                {
                    localOut.println(getText());
                }
            }

            class b extends a
            {
                String getText() throws java.io.IOException 
                {
                    return "Hello from JSP!";
                }
            }
        %>     
        <%
            localOut = out;     

            b bObject = new b();

            bObject.printem();
        %>
    </BODY>
</HTML>








23.14.Class in JSP Page
23.14.1.Using Inheritance
23.14.2.Using Restricted Access
23.14.3.Calling Superclass Constructors
23.14.4.Using Parameterized Constructors
23.14.5.Working With Constructors and Inheritance
23.14.6.Overloading Methods
23.14.7.Overriding Methods in derived class
23.14.8.Using Superclass Variables With Subclassed Objects
23.14.9.Runtime Polymorphism
23.14.10.Using Abstract Classes
23.14.11.Creating a Java Interface