How to Call Superclass Constructors in java

Calling Superclass Constructors

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

class a
{
a() throws java.io.IOException
{
localOut.println("In a\'s constructor...
");
}
}

class b extends a
{
b() throws java.io.IOException
{
localOut.println("In b\'s constructor...
");
}
}
%>
<%
localOut = out;

b obj = new b();
%>