Java 8 Cheatsheet

Syntax for Java 8 lambda expressions:

Syntax: (parameters) -> expression
  e.g. (int x, int y) -> x + y

Syntax: (parameters) -> statement
   e.g. () -> System.out.println("hi " + s)

Syntax: (parameters) -> { statements }
  e.g.  (String s) -> { int n = s.length(); return n; }

Syntax for Java 8 method references:

Syntax: Class::staticMethod
  e.g.  Arrays.sort(items, Util::compareItems);

Syntax: instance::instanceMethod
  e.g.  items.forEach(System.out::print);

Syntax for Java 8 default methods:

Syntax:
 interface InterfaceName {
     default ReturnType methodName() {
 }

Example code:
 interface Descriptive {
     default String describe() {
         implementation
         return "fantastic";
     }
 }