Core Java
- Modern Java - What’s new in Java 9 to Java 17
- Java 8 Lambdas, Functional Interface & "static" and "default" methods
- What is differences between JDK, JVM and JRE ?
- Method Reference in Java (Instance, Static, and Constructor Reference)
- What is ClassLoader in Java ?
- Object Oriented Programming (OOPs) Concept
Mar 31, 2024
Method references are compact, easy-to-read lambda expressions for methods that already have a name.
Sometimes, a lambda expression does nothing but call an existing method. In those cases, it's often clearer to refer to the existing method by name.
There are four kinds of method references: bound, unbound, static, and constructor.
1) Bound Method References
A "bound method reference" refers to an instance method that's bound to a receiver object; its syntax is: containingObject::instanceMethodName.
2) Unbound Method References
An "unbound method reference" refers to an instance method that's not bound to a receiver object; its syntax is: ContainingType::methodName.
However, because an instance method still requires a receiver object, the receiver object is created by the JVM.
3) Constructor References
You can use a method reference to refer to a constructor without instantiating the named class; its syntax is: ClassName::new.
Constructor References with multiple parameters
For constructors with more than two parameters we need to create your own Functional Interfaces:
4) Static Method References
A "static method reference" refers to a static method in a specific class; its syntax is: ContainingClass::staticMethodName.
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As needed, the same method reference or lambda can be assigned to different functional interfaces.
What is differences between JDK, JVM and JRE ?
What is ClassLoader in Java ?
NK Chauhan
NK Chauhan is a Principal Software Engineer with one of the biggest E Commerce company in the World.
Chauhan has around 12 Yrs of experience with a focus on JVM based technologies and Big Data.
His hobbies include playing Cricket, Video Games and hanging with friends.