Gain insights into Java 8's new features: lambdas, Stream API, Functional Interfaces, Collections improvements, Memory Management, and Date & Time API to enhance productivity and code quality.

Java 8 has introduced a ton of features and enhancements to boost developer productivity, while making your code faster, more concise, and more readable. 
In this course, you will learn about lambdas, Java Stream API, Functional Interfaces, as well as lots of other new improvements related to Collections, Memory Management, Date & Time API. 
After completing this course, you’ll be well versed in all the functionality of Java 8 and be ready to utilize these new features in your own code.

Java 8 for Experienced Developers: Lambdas, Stream API & Beyond

# What is a lambda expression?
Java is an object-oriented language. By introducing lambdas in Java 8, the authors of Java tried to add elements of functional programming in Java. Now you might be wondering what the difference between object-oriented programming and functional programming is?

In **object-oriented programming**, objects and classes are the main entities. If we create a function then it should exist within a class. A function has no meaning outside the scope of the class object.

In **functional programming**, functions can exist outside the scope of an object. We can assign them to a reference variable and we can also pass them to other methods as a parameter.

A **lambda expression** is just an anonymous function, i.e., a function with no name and that is not bound to an identifier. We can pass it to other methods as parameters, therefore, using the power of functional programming in Java.

# How to write a lambda expression

It might be difficult to understand what lambda is and how to write a lambda without looking at an example. So, let's look at an example first, and then we will revisit what we just read.

In the below example, we have a functional interface called `Greeting`. There are two classes `HindiGreeting` and `EnglishGreeting` that implement this interface.


Learn how to write your first lambda expression.

Let's Begin

Taste of lambdas

Stream API

Java 8 Collections Improvements

Java 8 Concurrency API Improvements

Java Time API

Conclusion

Writing your first lambda

What is a lambda expression?