Lambda expressions of .NET in Java

I recently moved from C# to Java [again]. But I开发者_运维技巧 badly miss lambda expressions and things like IEnumerable.Foreach of C#. So I am looking for a lambda expression library in Java.

are there better libraries than LambdaJ?

Also is clojure directly inlinable in Java programs? That is can I mix clojure code in Java functions?

Java 8 might have lambda support natively. Until then you can use a combination of anonymous inner classes and libraries like google-guava. Below are other libraries that you can look into

• http://commons.apache.org/collections/
• http://functionaljava.org/
• http://functionalj.sourceforge.net/
• http://www.agical.com/jambda/

Or better look at Scala

The equivalent foreach loop in Java is structured like this

List<Foo> fooList = // some list containing foos
for (Foo foo : fooList){
    // do stuff
}

There are no lambda expressions in Java, however if you can wait until Java8 they are adding closures. The closest you can get are anonymous inner classes.

The Google Guava library contains Function and Predicate classes that can be used to emulate lambda-like functionality. As kgrad mentions above, you can create anonymous instances of each one.

http://guava-libraries.googlecode.com/svn/trunk/javadoc/com/google/common/base/Function.html
http://guava-libraries.googlecode.com/svn/trunk/javadoc/com/google/common/base/Predicate.html

Although you could easily write classes like these yourself, Guava contains a lot of helper methods that utilize functions and predicates for doing things like transforming or filtering all different types of iterables: http://guava-libraries.googlecode.com/svn/trunk/javadoc/com/google/common/collect/Iterables.html

Note: I realize that Pangea already posted a link to Google Guava above, but I had already started writing this post and thought it would still be useful to provide the links.