Java 8 Cheat Sheet

 str -> System.out.println(str)
 () -> System.out.println(this)
 (String str) -> System.out.println(str)
 (String s1, String s2) -> { return s2.length() - s1.length(); }
 (s1, s2) -> s2.length() - s1.length()

Function f = Object::toString
Supplier s = thing::toString
Stream<File> pdfs = getFiles().filter(FileFilters::fileIsPdf)