Method Reference and Constructor Reference by Double Colon Operator: #java8 #java8features

Q1: What is the double colon (::) operator in Java 8?
A: The double colon operator is used for method reference and constructor reference in Java 8, providing a shorthand notation.

Q2: How is method reference different from a lambda expression?
A: Method reference is a shorthand syntax to refer to a method by its name, whereas a lambda expression is an anonymous function.

Q3: What types of method references exist in Java 8?
A: There are four types:

Reference to a static method
Reference to an instance method of a particular object
Reference to an instance method of an arbitrary object of a particular type
Reference to a constructor
Q4: Provide an example of using method reference in Java 8.

Q5: How does constructor reference simplify object creation in Java 8?
A: Constructor reference allows you to use a constructor as a reference for creating instances, reducing boilerplate code.