JSP: Exemple de Polymorphisme en jsp

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<HTML>
    <HEAD>
        <TITLE>Runtime Polymorphism</TITLE>
    </HEAD>
 
    <BODY>
        <H1>Runtime Polymorphism</H1>
 
        <%!
            javax.servlet.jsp.JspWriter localOut;
 
            class a
            {
                public void print() throws java.io.IOException 
                {
                    localOut.println("Hello from a...<BR>");
                }
            }
 
            class b extends a
            {
                public void print() throws java.io.IOException 
                {
                    localOut.println("Hello from b...<BR>");
                }
            }
 
            class c extends a
            {
                public void print() throws java.io.IOException 
                {
                    localOut.println("Hello from c...<BR>");
                }
            }
 
            class d extends a
            {
                public void print() throws java.io.IOException 
                {
                    localOut.println("Hello from d...<BR>");
                }
            }
        %>     
        <%
            localOut = out;     
    
            a a1 = new a(); 
            b b1 = new b(); 
            c c1 = new c(); 
            d d1 = new d(); 
            a baseClassVariable;
    
            baseClassVariable = a1;
            baseClassVariable.print();
    
            baseClassVariable = b1;
            baseClassVariable.print();
    
            baseClassVariable = c1;
            baseClassVariable.print();
    
            baseClassVariable = d1;
            baseClassVariable.print();
        %>
    </BODY>
</HTML>
           
       

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Categories: Java, Python
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