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Clojure for Java Developers

Clojure for Java Developers

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Clojure for Java Developers

Clojure for Java Developers

Overview of this book

We have reached a point where machines are not getting much faster, software projects need to be delivered quickly, and high quality in software is more demanding as ever. We need to explore new ways of writing software that helps achieve those goals. Clojure offers a new possibility of writing high quality, multi-core software faster than ever, without having to leave your current platform. Clojure for Java developers aims at unleashing the true potential of the Clojure language to use it in your projects. The book begins with the installation and setup of the Clojure environment before moving on to explore the language in-depth. Get acquainted with its various features such as functional programming, concurrency, etc. with the help of example projects. Additionally, you will also, learn how the tooling works, and how it interacts with the Java environment. By the end of this book, you will have a firm grip on Clojure and its features, and use them effectively to write more robust programs.
Table of Contents (9 chapters)
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8
Index

Polymorphism in Java

Java uses polymorphism heavily, its collection API is based on it. Probably the best examples of polymorphism in Java are the following classes:

  • java.util.List
  • java.util.Map
  • java.util.Set

We know that depending on our use case we should use a particular implementation of these data structures.

If we prefer to use an ordered Set, we might use a TreeSet.

If we need a Map in a concurrent environment, we will use a java.util.concurrent.ConcurrentHashMap.

The beautiful thing is that you can write your code using the java.util.Map and java.util.Set interfaces and if you need to change to another type of Set or Map, because the conditions have changed or someone has created a better version of the collection for you, you don't need to change any code!

Lets look at a very simple example of polymorphism in Java.

Imagine that you have a Shapes hierarchy; it might look similar to the following code:

package shapes;

public interface Shape {
  public double getArea();
}

public class...
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Clojure for Java Developers
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