java code for Runtime Polymorphism

Runtime Polymorphism

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

class a
{
public void print() throws java.io.IOException
{
localOut.println("Hello from a...
");
}
}

class b extends a
{
public void print() throws java.io.IOException
{
localOut.println("Hello from b...
");
}
}

class c extends a
{
public void print() throws java.io.IOException
{
localOut.println("Hello from c...
");
}
}

class d extends a
{
public void print() throws java.io.IOException
{
localOut.println("Hello from d...
");
}
}
%>
<%
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();
%>