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

The `Clock` can be used in conjunction with dates and times to help build your tests. During production, a normal `Clock` can be used, and then a different one is used during tests.

To get the default clock, use the following:
``` java
Clock.systemDefaultZone();
```
The `Clock` can then be passed into factory methods. For example:
``` java
LocalTime time = LocalTime.now(clock);
```

# Period and Duration
Java 8 has two types for representing time differences as humans understand them: Period and Duration.

 **Period** is a date-based amount of time, such as “2 years, 3 months, and 4 days.” **Duration** is a time-based amount of time, such as “‘34.5 seconds.”

Periods and Durations can be determined using the `between` method:

``` java
Period p = Period.between(date1, date2);
Duration d = Duration.between(time1, time2)
```
They can also be created using static methods. For example, Durations can be created for any amount of seconds, minutes, hours, or days:
``` java
Duration twoHours = Duration.ofHours(2);
Duration tenMinutes = Duration.ofMinutes(10);
Duration thirtySecs = Duration.ofSeconds(30);
```
Periods and Durations can be added or subtracted from Java 8 date types. For example:

``` java
LocalTime t2 = time.plus(twoHours);
```

Let's combine the code below:


Learn about the features included in the date and time API.

API Features

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

API Features

Clock

Period and Duration