Lambda Expressions -> Java

Identify a functional interface as an interface with one abstract method, and distinguish abstract from non-abstract methods, noting the optional functional interface annotation and its checks.

Explore lambda expressions as anonymous, nameless functions, compare them with named methods that add two numbers, and learn the syntax, optional parameters, and converting methods to lambdas in Java 8.

Explore Java 8's predefined functional interface Function, which takes one input and returns one output, using apply, with examples like currency conversion and square calculations.

Demonstrate chaining functions with andThen and compose on the predefined functional interface Function, showing input flowing through function1 and function2 to produce uppercased and appended results.

Explore how the supplier predefined functional interface in Java 8 handles no-input value generation, allowing you to return an INR rate with supplier.get rather than a custom method.