What are method references?
Method references are a feature of Java 8 . The biggest addition in Java8 has been lambda expressions . Method Reference is the shorthand syntax for a lambda expression that executes just ONE method. It allows us to reference constructors or methods without executing them. Method references and Lambda are similar in that they both require a target type that consist of a compatible functional interface. An interface with only one method is called a functional interface. For example, Comparable, Runnable, AutoCloseable are some functional interfaces in Java. The double colon (::) operator is used for method reference. You can access a method (lambda expression) using the :: notation.
A method reference can be used to point the following types of methods:
- Static methods
- Instance methods
- Constructors using new operator (TreeSet::new)