Learn about Lambdas, Java Stream API, as well as lots of other new improvements made in Java 8.

Java for Programmers

New Features in Java 8

In Java 8 streams the intermediate operations are not evaluated until a terminal operation is invoked.

Each intermediate operation creates a new stream, stores the provided operation/function, and returns the new stream. When a terminal operation is called, the traversal of streams begins and the associated function is performed one by one on each element.

## Lazy evaluation example

Let's look at an example to understand how lazy evaluation helps immensely.
In the below example, we have a list of 20 integers. We need to get the first number we encounter that is greater than 5 and is divisible by 3 in this list.

In Java 8 streams the intermediate operations are not evaluated until a terminal operation is invoked.

Each intermediate operation creates a new stream, stores the provided operation/function, and returns the new stream. When a terminal operation is called, the traversal of streams begins and the associated function is performed one by one on each element.

# Lazy evaluation example

Let's look at an example to understand how lazy evaluation helps immensely.
In the below example, we have a list of 20 integers. We need to get the first number we encounter that is greater than 5 and is divisible by 3 in this list.

In this lesson, we discuss how streams are evaluated lazily.

Introduction

Taste of lambdas

Stream API

Java 8 Concurrency API Improvements

Java Time API

The Way Forward

Lazy Evaluation in Streams