collection question

Question

In a Banking system what is the need of collection. if collection is needed to store object of every customer then why don't we store in sql

Answer 1

A collection stores objects/values only as long the code is running or - to be more precise - as long as a variable in use refers to it. After that it can be garbage collected and is lost.
So, you're right... To store data permanently, you need to find another way (e.g. database or files).

Answer 2

be more specific. Is that an exercise? Or just a question that came up to your mind?

Answer 3

giannis...i want to use collection in my project to learn.. i could not understand where can i use collection ?