Currently, functional programing in Java often requires creating anonymous
classes.  For example:

List<Integer> ints = Arrays.asList(new Integer[] { 1, 2, 3 });
List<Integer> negativeInts = map(ints, new IntTransformer() {
  public int transform(int _) {
    return -_;
  }
});

The BlockSyntaxInJava offers some C-preprocessor macros to reduce the amount
of code that's needed:

List<Integer> ints = Arrays.asList(new Integer[] { 1, 2, 3 });
List<Integer> negativeInts = MAP_LO_LO(ints, Integer, Integer, { return -_; });

The name of the macro MAP_LO_LO can be read as:
 1. "Map..."
 2. "...from a List of objects..."
 3. "...to a List of objects."

The macro MAP_OC_OC takes four parameters:
 1. the List of objects to read as input
 2. the class of the input objects
 3. the class of the output objects
 4. the contents of the anonymous closure, ending with a return statement.