How to traverse Table data in Java and pass that to servlet for using in JSP

I am a PHP programmer and got to know that for me Object oriented-ness, Strict type, and missing powerful array from PHP can be a big problem in Java. I tried to get code related to above question but no one works.

My questions:

How to traverse table in various way?

Is there any good tutorial for me related to collection that can be helpful for PHP programmer. I learned Oracle tutorial but that has not solved my problem. That may require lots of attention! I need practical way to learn.

Is there any good method to know how object are structured inside? In PHP I can use print_r, var_dump and can see what is inside.

Here is more explanation asked by a commenter:

 try {  
   ArrayList Rows = new ArrayList();  

   while (开发者_JAVA百科resultSet.next()){  
   ArrayList row = new ArrayList();  
   for (int i = 1; i <= 7 ; i++){  
           row.add(resultSet.getString(i));  
   }  

   Rows.add(row);  
}  

Here, do I have a leisure to add complete rows at a time and use that in ArrayList? I do not want to use getString()/getInteger() etc on each column. Or in Java, I need to get every column data one by one.

The standard Java release has no way to conveniently dump a collection. I would be surprised, however, if you couldn't find a non-standard class that does this.

That being said, if you run your code in an IDE and use the debugger you can get what you want pretty easily.

In the past i use this library : jbeandumer it worked for me. Here is an introduction.