Gain insights into Java 17, cloud and microservices, reactive programming, and top JVM languages. Explore hands-on projects using Scala, Groovy, and Gradle to boost your software development career.

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This course is meant for Java programmers or aspiring programmers who want to know about the latest Java and JVM technology. Throughout this course, you will get several opportunities to get hands-on experience with various Java concepts. 

This course will help you understand the latest in Java up to version 17; cloud and microservices; build, testing, and web frameworks; reactive programming in Java; and the best JVM languages so you can advance your career in software development. 

Moreover, you will also get to work with Scala, Groovy, and Gradle. The course explains Java concepts in detail and also draws comparisons with its older versions, as well as JVM languages.

The All-in-One Guide to Java Programming

## Introduction to grouping and partitioning

The `groupingBy` collector groups elements based on a function we provide. For example:

``` Java
List<Dragon> dragons = getDragons();
Map<Character,List<Dragon>> map = dragons.stream()
        .collect(groupingBy(dragon -> dragon.getName().charAt(0)));
```
Similarly, the `partitioningBy` method creates a map with a boolean key. For example:

``` Java
// Group by whether or not the dragon is green
Map<Boolean,List<Dragon>> map = dragons.stream()
         .collect(partitioningBy(Dragon::isGreen));
```





# Introduction to grouping and partitioning

The `groupingBy` collector groups elements based on a function we provide. For example:

``` Java
List<Dragon> dragons = getDragons();
Map<Character,List<Dragon>> map = dragons.stream()
        .collect(groupingBy(dragon -> dragon.getName().charAt(0)));
```
Similarly, the `partitioningBy` method creates a map with a boolean key. For example:

``` Java
// Group by whether or not the dragon is green
Map<Boolean,List<Dragon>> map = dragons.stream()
         .collect(partitioningBy(Dragon::isGreen));
```





Learn about the `groupingBy` and `partitioningBy` method.

Grouping and Partitioning

Introduction

Java Syntax and Conventions

Java 7

Idiomatic Java 8: Lambdas, Streams, and Dates

New Date and Time API

Java 8 Miscellaneous

Advantages of Java 9

Java 10 - 17

Java Ecosystem

Maven and JUnit

Utilizing Essential Libraries

Modern Java Concurrency

RxJava

Other JVM Languages

Groovy

Gradle

Spock

Scala

RESTful

Microservices and Clouds

Grails

Spark

Spring Boot

Play Framework

Ratpack

Final Thoughts

Appendix

Grouping and Partitioning

Introduction to grouping and partitioning