Get started with lambda expressions in Java

Before Java SE 8, anonymous classes were typically used to pass functionality to a method. This practice obfuscated source code, making it harder to understand. Java 8 eliminated this problem by introducing lambdas. This tutorial first introduces the lambda language feature, then provides a more detailed introduction to functional programming with lambda expressions along with target types. You’ll also learn how lambdas interact with scopes, local variables, the this and super keywords, and Java exceptions. 

Note that code examples in this tutorial are compatible with JDK 12.