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Java 8 Method References


Java 8 introduced a new feature called "Method Reference". It is used to refer methods of functional interfaces. They are effectively a subset of lambda expressions, because if a lambda expression can be used, then it might be possible to use a method reference, but not always.

Here is the list of types of Method references and its syntax.

Kind Syntax Example
Reference to a static method Class::staticMethodName String::valueOf
Reference to an instance method object::instanceMethodName x::toString
Reference to a constructor ClassName::new String::new

And here is the way to represent Lambda expression and Method references:

Kind As Method Reference As Lambda
Reference to a static method String::valueOf (s) -> String.valueOf(s)
Reference to an instance method x::toString () -> "java2novice".toString()
Reference to a constructor String::new () -> new String()

We have given examples for each type of method reference here:

Java-8 Method References Examples

  1. Method Reference - Reference to a Static Method example.
  2. Method Reference - Reference to a Instance Method example.
  3. Method Reference - Reference to a Constructor example.
Knowledge Centre
What is adapter class?
An adapter class provides the default implementation of all methods in an event listener interface. Adapter classes are very useful when you want to process only few of the events that are handled by a particular event listener interface. You can define a new class by extending one of the adapter classes and implement only those events relevant to you.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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