by 19WAS85

19WAS85 / coollection

A cool way to manipulate collections in Java.

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Hey folks! I have not been around, as you can see. However, I know many devs still using coollection, and even creating their own forks. I'm open to anyone who decides to keep this alive, please get in touch.


A cool way to manipulate collections in Java.

Iterate over a collection is a medieval way to filtering, mapping and ordering. And with Java we are used to work like that. Coollection changes that, is the future, while closures don't arrive for Java.

How it works?

It's easy to use. Just add

import static org.simple.coollection.Coollection.*;
in your class and that's it!

How to use this?

1 - Filter

First you need a Collection. Here we create a Animal List, and we called it animals.

List animals;

Later you goes add a lot of animals in this list.

Now, you want to take all cats, it's easy for Coollections! In this case, name is a method (
from(animals).where("name", eq("Cat")).all();

Or, would the first animal with 2 year old? Easy too!

from(animals).where("age", eq(2)).first();

2 - Filter specification

You can be more specific in your query, adding more specifications, like and and or.

from(animals).where("name", eq("Lion")).and("age", eq(2)).all();
from(animals).where("name", eq("Dog")).or("age", eq(5)).all();

3 - Matchers

There are other matchers to be precise!


Or a special matcher, called not.


4 - Order

Order is a very interesting feature to sort your collection.

from(animals).where("name", eq("Cat")).orderBy("age").all();
from(animals).where("age", eq(5)).orderBy("name", Order.DESC).first();

You can use just order, without filter.


Be happy!

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