Effective Java 2nd Edition

Book Review of Effective Java, Second Edition

+Effective Java+, Second Edition is certainly the best Java book I have read in a long time. As a disclaimer, I never read the first edition and I am thus unable to compare the two editions. +Effective Java+, Second Edition is a mostly easy and fun read providing you with many insights and best practices on how to use Java effectively. It certainly is not a book for the beginner just starting out learning Java. For that purpose you may want to take a look at +Thinking in Java+ by Bruce Eckel instead. Nevertheless, +Effective Java+ would serve as an excellent follow-up.

In +Effective Java+, Joshua Bloch does a great job describing best practices that you as developer will find useful on a daily basis. For example, I really found his description of the builder pattern (Item 2, page 11) quite interesting. Another Item that fascinated me, was Item 15 (page 73) – “Minimize mutability”. Both items are part of a broader theme throughout the book that promotes creating code that is as immutable as possible. In that regard, reading the book will enable you to simply write better and safer code. The book also leads the way towards promoting functional programming techniques which will come in quite handily when developing multithreaded applications. Therefore, as a next book I may recommend reading +Java Concurrency in Practice+ by Brian Goetz.

Even for the experienced Java developer, +Effective Java+ contains quite a few little eye openers. I for example was previously unaware of how static factory methods can simplify the creation of parameterized type instances using “type inference”. This example is described on page 9 (Item 1). In the past I had always used something like this:

List users = new ArrayList();

But by using a static factory method you can do:

List users = Helper.newArrayList();

I thought that this was a pretty nifty example that may help making code a bit cleaner. What I also very much liked about +Effective Java+ was that Joshua points out certain short-comings of the Java language itself and its APIs whenever applicable. For example, page 64 describes the inconsistent behavior between BigDecimal’s ‘equals’ method and its ‘compareTo’ method, and in item 41 (page 194) Joshua details the shortcomings of the List interface when using Autoboxing.

While the vast majority of the book was very easy to read and to understand, I found that the chapter about bounded wildcards using generics (item 28) was a little difficult to grasp and I wished it were a bit more extensive. On the other side, the provided mnemonic is quite helpful: PECS – Producer-extends, Consumer-super.

Overall, I *highly recommend* +Effective Java+, Second Edition which will continue to serve me, and likely you too, as an excellent reference resource.

Gunnar Hillert

[http://www.hillert.com]

[http://hillert.blogspot.com|http://www.hillert.com]

Posted in BookReviews
AJUG Meetup

Building and Deploying 12 Factor Apps in Scala and Java

June 20, 2017

The twelve-factor app is a modern methodology for building software-as-a-service apps:

• Use declarative formats for setup automation, to minimise time and cost for new developers joining the project.

• Have a clean contract with the underlying operating system, offering maximum portability between execution environments.

• Are suitable for deployment on modern cloud platforms, obviating the need for servers and systems administration.

• Minimise divergence between development and production, enabling continuous deployment for maximum agility.

• And can scale up without significant changes to tooling, architecture, or development practices.

We will build a RESTful web service in Java and deploy the app to CloudFoundry. We will go over how to build a cloud manifest, how to keep our database credentials and application configuration outside of our code by using user-provided services and go over what it takes to build a 12 Factor application in the cloud. This presentation will be heavy on code and light on slides!

Location:


Roam Dunwoody

1155 Mount Vernon Highway NE
Atlanta, GA 30338 (map)

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