lambda expressions and functional interfaces

Lambda expressions make it possible to write more concise and expressive Java code by treating behavior as data. They are commonly used together with functional interfaces, which contain a single abstract method. In this section, you’ll learn how lambdas work, how they replace anonymous classes, and how built-in functional interfaces such as Predicate, Function, Consumer, and Supplier are used. You’ll also understand method references and common lambda patterns. These concepts form the foundation of modern functional-style programming in Java.