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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Java 12

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Java 16

Java 17

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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


# For each
The most basic thing we can do with a stream is loop through it using the `forEach` method. 

For example, to print out all of the files in the current directory, we could do the following:

import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;
import java.io.File;
import java.io.IOException;

public class Program{

    public static void main(String[] args)throws IOException{ 
        Files.list(Paths.get("."))
            .forEach(System.out::println);
    }

}

For the most part, this replaces the `for` loop. It is more concise and more object-oriented since we are delegating the implementation of the actual loop.

# Map, filter, and reduce
Lambda expressions and default methods allow us to implement map/filter/reduce in Java 8. Actually, it is already implemented for us in the standard library.

Let's see how these methods can be implemented:

import java.util.*;
class Mapexample {
  public static void main(String args[]) {
    Map < String, Integer > map = new HashMap < String, Integer > ();
    map.put("Hello", 23);
    map.put("Gary", 123);
    map.put("Larry", 145);
    
    //Elements can traverse in any order  
    for (Map.Entry m: map.entrySet()) {
      System.out.println(m.getKey() + " " + m.getValue());
    }
  }
}

The above program creates a `map` with key and value pairs. It then prints them one-by-one.

Learn about the `forEach` and map/reduce method in Java 8.

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

For Each and Map/Reduce