Scala is a Java-compatible programming language with many modern language features. It is Java-compatible in that Scala and Java classes can directly reference each other and subclass each other with no glue code needed. It includes modern language features such as closures, pattern-matching, parametric types, and virtual type members. . This package includes the various tools used to develop code written in Scala. It includes a compiler (scalac), an interpreter and script runner (scala), the offline compiler (fsc), and source-scanning documentation generator (scaladoc).