how do we know which collection class to use when?

[Adithi]

Hi ,

We have many collection classes,ArrayList, HashSet,Vector etc.

How do we analyse and decide which one to use when.

Thanks.

[Junky]

Experience.

Are you going to dump all your homework questions on the forum? Have you done any research to answer these questions yourself?

[Adithi]

Excuse me... These are not my home work questions..they are my own questions... and as I donot have experience, and want to know/learn something, I keep posting here(New To Java Forum).. that the experienced guys help us learn..

[Eranga]

What Junky asking here is that your question is not more descriptive. In other words your question give me an impression that you have not read/search anything related with your question. If you have did that you may ask a question something like "Why we are using a ArrayList instead LinkedList in case of ...?". Did yu get our point?

[Eranga]

Read about three main collections on Java DOC and other stuff, which as Set, List and Map. Then try to summarize them. Adding them into a table is really nice. For example, when comes to the collections in a List you can store duplicates items (relevant to key) while in Sets or Maps you cannot.

[vinci123]

what about next??i mean how to implement them in real world examples?

[sunde887]

Understanding how they work will help you understand the situations in which they are used.

[Eranga]

Understanding how they work will help you understand the situations in which they are used.

I agreed with Sunde. Without having a better understanding, you never understand the practical aspect of such.