What is Java collection Framework

[Nipuna]

what is Java collection Framework?

I saw some when searching as i can see it is like Linux Directory List. Like Home->usr and so on.

[Neo]

I saw some when searching as i can see it is like Linux Directory List. Like Home->usr and so on.

To start with, I don't see any relationship with this other than the use of LIST data structure which is available in Java collection Framework. It seems you didn't read the article completely. Just referred an example somewhere may be

Okay. to start with, Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. People who are in to computing know very well about data structures. Stack, Queues, Lists, Trees (Many types), Graph, Hash, etc...

In good old days, we had to implement those ourselves. But now in Java, you have them already implemented. For example, if you need a queue (Last In First Out (LIFO) structure) for your application, then you can simply use java.util.Queue. If you have learned Data Structures & Algorithms already, you know what are these.

See the Oracle article Introduction to the Collections Framework.

Note that you need to carefully read from top to bottom. Don't try to read something from the middle and try to understand it.

[Nuwa]

The Collections Framework consists of three parts

1)Interfaces, the abstract data types that the framework supports.
2)Implementations, the concrete versions of these interfaces.
3)Algorithms, the predefined actions that can be defined on either the interfaces or their implementations.

1)All implementations are unsynchronized.
2)All implementations are serializable and can clone.
3)All implementations support having null elements.

For more:- http://download.oracle.com/javase/tutor ... index.html

[Nipuna]

Thanks Neo and Nuwa.

Actually I didn't read about Java Collection framework in Java I did as Neo said just viewed a Picture I didn't study the parts after the First Assignment of Java in BIT. Because There were so many Problems and I got low marks for Questions. So I stopped it for later Study. But I did Assignment some how and Passed

That's why I didn't understood it well. One thing for my lacking interest for Java is we can't get an input easily like other Languages. in C++ we can use

Code: Select all

cin>> 

But In java there is more to type and not easy like Any other Language That i know.

[Saman]

It is just that you haven't referred the most simplest points in Java. There are many methods for this and Java is very powerful in not only reading an input but also in verifying the data on the input. I started a new topic since I don't like to make the forum a mess by off-topic discussions
See How to get an input from keyboard using Java.

[Nipuna]

Thanks a Lot Saman