Scala Vs Java

Scala has a set of features, which differ from Java. Some of these are:
note: few of them got introduced in Java 1.8

• All types are objects. (Int, Short, Long, Byte etc.)
• Type inference. (val s = "scala". s is of type string which will be determined by scala compiler at runtime)
• Nested Functions. ( def f { def b { ) }  } )
• Functions are objects.
• Domain specific language (DSL) support.
• Traits. 
• Closures. ( val s = "is awesome"; val o = Option("scala").map { _ + s} ) 
• Lambdas 
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• Concurrency support inspired by Erlang. { package scala.actors.Actor._ }
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• Case Class
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• Implicit conversion ( implicit def toString(i: Int) = i.toString )