Actual Mechanism of Object class as Parent Class to all the classes

Hi All,
We know that all the classes in the java platform are descendants of Object class. Even if we are writing a new class also, in the absence of any other explicit superclass, every class is implicitly a subclass of Object. As we are not extending the Object class directly, then how come the methods in the Object are inheriting to the Sub class what we have written? How the java maintain this heirarchy?
Can you please explain this elaborately?
Thanks in Advance,
Uday

Udaya Shankara Gandhi wrote:
Hi All,
We know that all the classes in the java platform are descendants of Object class. Even if we are writing a new class also, in the absence of any other explicit superclass, every class is implicitly a subclass of Object. As we are not extending the Object class directly, then how come the methods in the Object are inheriting to the Sub class what we have written? How the java maintain this heirarchy? Because the language is defined that way. Compilers implement the language according to the rules of the JLS. Exactly how they do that is undefined. It's up to each compiler. As long as it follows the rules defined in the JLS for parsing the code and generating the .class file, that's all that matters. However, somewhere in the compiler is code that does approximately this:
if (class has an extends clause) {
generate corresponding bytes for extends in .class file
else {
generate bytes for extends java.lang.Object in .class file
}No great mystery, nor philosophical question.

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String link = "customerlogin.jsp";
session.setAttribute("prevPage", link);
session.setAttribute("errorMsg", error_msg);
}%>
****** web.xml in Log\WEB-INF is **********
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Log\AuthenBean</servlet-name>
<servlet-class>Log\AuthenBean</servlet-class>
</servlet>
<servlet>
<servlet-name>Log\ExecuteQuery</servlet-name>
<servlet-class>Log\ExecuteQuery</servlet-class>
</servlet>
</web-app>
Your help would be appreciated
Thanks!

Your problem is in web.xml. Only servlet classes need to be mapped. Your bean class should not be.
****** web.xml in Log\WEB-INF is **********
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web
Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Log\AuthenBean</servlet-name>
<servlet-class>Log\AuthenBean</servlet-class>
</servlet>
<servlet>
<servlet-name>Log\ExecuteQuery</servlet-name>
<servlet-class>Log\ExecuteQuery</servlet-class>
</servlet>
</web-app>
If you have only jsps, u mau use
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web
Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
</web-app>
Hope it works.
Hafizur Rahman
SCJP

JSP Accessing variables in a class that are located outside of the class

I am having a problem accessing a nested HashMap in a function. The HashMap is defined before the HTML starts and the function is located near the end (Shouldn't make a difference).
List tires = databean.getTires();
Map frontTireInfo = (Map)tires.get(0); //Works
Map rearTireInfo = (Map)tires.get(tires.size()-1); //Works
Map neumaticos = new HashMap();
for(Iterator itr=tires.iterator();itr.hasNext();) {
     HashMap tempTire = (HashMap)itr.next();
     String tirePosition = (String)tempTire.get("position");
     neumaticos.put(tirePosition, tempTire);
<HEAD>. . . </HEAD>
<BODY>. .
<%=getTireInspectionTable("FRONT_RIGHT")%> //Works
</BODY>
I believe the above stores the tempHash in the tirePosition.
<%!
     private String getTireInspectionTable(String tirePos) {
          StringBuffer sb = new StringBuffer();
     sb.append("<input type='text' value=" +
*****<% neumaticos.get(tirePos) %> + " />" ) illegal start of expression
return sb.toString();
%>
Why can I not access neumaticos in the method?
I am able to call other methods from this one, but not variables.
If it is possible, please help point me in the correct direction.
Thanks in advance,
Mike

MPDreiding wrote:
     sb.append("<input type='text' value=" +
*****<% neumaticos.get(tirePos) %> + " />" ) illegal start of expression
          Illegal start of expression sounds like a compile time error so your syntax is wrong. Why are you using scriptlet
<% neumaticos.get(tirePos) %>
inside of declaration? I think that's the problem. Just remove <% and %> and see what happens.

Actual Mechanism of Object class as Parent Class to all the classes

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