anchor.diff:  **(Classname/staticMethod args*)**
   **Classname/staticField**
   
  -[source,clojure]
  +[source,clojure-repl]
   ----
   (.toUpperCase "fred")
   -> "FRED"
  
positive.code: All other Java classes should be treated as implementation details, and applications should avoid relying on them.
  
  To lookup and call a Clojure function:
  [source,clojure]
  ----
  IFn plus = Clojure.var("clojure.core", "+");
  plus.invoke(1, 2);
  ----
  Functions in clojure.core are automatically loaded. Other namespaces can be loaded via require:
  [source,clojure]
  ----
  IFn require = Clojure.var("clojure.core", "require");
  require.invoke(Clojure.read("clojure.set"));
  ----
  IFns can be passed to higher order functions, e.g. the example below passes plus to read:
  [source,clojure]
  ----
  IFn map = Clojure.var("clojure.core", "map");
  IFn inc = Clojure.var("clojure.core", "inc");
  map.invoke(inc, Clojure.read("[1 2 3]"));
  ----
  Most IFns in Clojure refer to functions. A few, however, refer to non-function data values. To access these, use deref instead of fn:
  [source,clojure]
  ----
  IFn printLength = Clojure.var("clojure.core", "*print-length*");
  IFn deref = Clojure.var("clojure.core", "deref");
  
negative.code: 
  Symbols representing class names are resolved to the Class instance. Inner or nested classes are separated from their outer class with a `$`. Fully-qualified class names are always valid. If a class is `import`ed in the namespace, it may be used without qualification. All classes in java.lang are automatically imported to every namespace.
  
  [source,clojure-repl]
  ----
  String
  -> java.lang.String
  