Problem with save into memory

Question

Hay,..
I'm now build web application.
I'm confused with this case :
I have 2 form, 1st form contain 1 field name and 1
button next. i filled name with my name harry and i
click next. it will save INTO MEMORY, NOT DATABASE.
Now it continue to 2nd form. 2nd form will show
"welcome harry" & contain dropdown button contain list
of book & 2 button finish and add to basket. when i
select book from dropdown button and i click add to
basket, it will return the same form but below the
form appear the book i've selected etc. But remember
IT NOT SAVE INTO DATABASE. When i click finish NOW ITS
SAVE TO DATABASE.
My question is how we can save into memory ?
i used tomcat 4.1.29 as container and velocity as
presentation layer and jdk1.5.0
Thanks before

Answer 1

Every time you assign to a variable, you're saving to memory: int i;
Object o;
i = 5; // I just saved 5 into the memory location that I know as the int variable i.
o = new Object(); // I just saved a reference to an Object in the memory location that I know as reference variable oMaybe you're asking about how things are saved when you go from page to page in a web application? The usual way to do that, in a servlet envrionment, is with a session scoped bean (if you're using JSP), which you can get with JSP tags or by calling session.setAttribute.
This should be covered in any decent servlet/JSP tutorial