Web Reference: Mar 25, 2026 · Java Method References are a shorthand way to refer to an existing method without invoking it. They were introduced in Java 8 to make lambda expressions shorter, cleaner, and more readable. Method references use the double colon (::) operator and are mainly used with functional interfaces. One of the most welcome changes in Java 8 was the introduction of lambda expressions, as these allow us to forego anonymous classes, greatly reducing boilerplate code and improving readability. Method references are a special type of lambda expressions. They’re often used to create simple lambda expressions by referencing existing methods. There ar... Sometimes, however, 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. Method references enable you to do this; they are compact, easy-to-read lambda expressions for methods that already have a name.
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