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Using Abstract Classes

< 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>