What is the Java equivalent for LINQ? [closed]

Answer 1

LINQ to Objects - JAVA 8 has added the Stream API which adds support for functional-style operations on streams of values:

Package java.util.stream

Java 8 Explained: Applying Lambdas to Java Collections

LINQ to SQL/NHibernate/etc. (database querying) - One option would be to use JINQ which also uses the new JAVA 8 features and was released on Feb 26, 2014 on Github: https://github.com/my2iu/Jinq

Jinq provides developers an easy and natural way to write database queries in Java. You can treat database data like normal Java objects stored in collections. You can iterate over them and filter them using normal Java commands, and all your code will be automatically translated into optimized database queries. Finally, LINQ-style queries are available for Java!

JINQ project site: http://www.jinq.org/

Answer 2

It sounds like the Linq that everyone is talking about here is just LinqToObjects. Which I believe only offers functionality that can already be accomplished today in Java, but with really ugly syntax.

What I see as the real power of Linq in .Net is that lambda expressions can be used in a context requiring either a Delegate or an Expression and will then be compiled into the appropriate form. This is what allows things like LinqToSql (or anything other than LinqToObjects) to work, and allows them to have a syntax identical to LinqToObjects.

It looks like all of the projects referred to above are only offering the capabilities of LinqToObjects. Which makes me thing that LinqToSql-type functionality is not on the horizon for Java.

Answer 3

You can select the items in a collection (and much more) in a more readable way by using the lambdaj library

https://code.google.com/archive/p/lambdaj/

It has some advantages over the Quaere library because it doesn't use any magic string, it is completely type safe and in my opinion it offers a more readable DSL.

Answer 4

There is no equivalent to LINQ for Java. But there is some of the external API which is looks like LINQ such as https://github.com/nicholas22/jpropel-light, https://code.google.com/p/jaque/

Answer 5

There is nothing like LINQ for Java.

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Edit

Now with Java 8 we are introduced to the Stream API, this is a similar kind of thing when dealing with collections, but it is not quite the same as Linq.

If it is an ORM you are looking for, like Entity Framework, then you can try Hibernate

:-)

Answer 6

Scala.Now i star read it , and found it like linq but more simple and more unreadable. but scala can run at linux,yes? csharp need mono.