method reference in java

1Java provides a feature called method
2reference in Java 8. Method reference 
3is used to refer method of functional interface.
4  It is compact and easy form
5  of lambda expression. Each time when 
6  you are using lambda expression to just
7  referring a method, you can replace your
8  lambda expression with method reference.
9
10Types of Method References:
11- Reference to a static method.  Syntax ==> ContainingClass::staticMethodName  
12- Reference to an instance method.  Syntax ==> containingObject::instanceMethodName  
13- Reference to a constructor.  Syntax ==> ClassName::new