java

Summary: The Law of Demeter is discussed using Java source code examples.

Whenever you talk to a good, experienced programmer, they will tell you that "loosely coupled" classes are very important to good software design.

The Law of Demeter for functions (or methods, in Java) attempts to minimize coupling between classes in any program. In short, the intent of this "law" is to prevent you from reaching into an object to gain access to a third object's methods. The Law of Demeter is often described this way:

Java enum FAQ: Can you share some Java enum examples, such as how to declare a Java enum, and how to use a Java enum in a for loop, if then statement, and Java switch statement?

As described in Sun's Java documentation, a Java enum "is a type whose fields consist of a fixed set of constants ... you should use enum types any time you need to represent a fixed set of constants." Let's take a look at some Java enum examples to see how this works.

A lot of people want to sell Scala as a functional programming (FP) language. That's fine, it certainly is, and FP has many benefits. But when I first started working with Scala I was just looking for a "better Java".

Personally, I grew tired of Java's verbosity. Ruby showed us a different way, and I loved it, but ... after a while I felt like many of my unit tests in Ruby wouldn't be necessary if the language had static types. I wished for a concise Ruby-like language with static types.

I've been trying to find some good Scala currency and money libraries lately, and I just ran across the following list of projects on the Joda Money Github project. That URL contains the following list of Java and JVM-based projects that should all be usable in Scala:

Java Design Patterns FAQ: Can you provide an example of the Factory Pattern in Java?

Sure. In this article we'll look at a small-but-complete example of the Factory Pattern ("Factory Design Pattern") implemented in Java.