# Category: Java 8

This tutorial explains to you how to use Java Optional class.

This tutorial explains to you how to use LocalDate, LocalTime, LocalDateTime in Java.

This tutorial explains to you how to use a default method in a Java interface.

This tutorial explains to you how to use a static methods in a Java interface.

This tutorial explains to you what is and how to use the method and constructor references in Java.

This tutorial explains to you how to use forEach method in Java (for Collections).

This tutorial explains to you what a functional interface is in Java.

This tutorial explains to you what a lambda expression is in Java.

This tutorial explains to you what a Consumer interface is in Java.

This tutorial explains to you what a Supplier interface is in Java.

This tutorial explains to you what a Function interface is in Java.

This tutorial explains to you how we can compose functions in Java.

This tutorial explains what a CompletableFuture class is in Java.

This tutorial explains to you how to use stream() & parallelStream() methods with Collections.