Method Reference and Constructor Reference by Double Colon Operator:
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.
A: An example is using List.forEach(System.out::println) as a method reference for printing elements.
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.
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