by Miško Hevery
I think of bugs as being classified into three fundamental kinds of bugs.

Logical: Logical bug is the most common and classical “bug.” This is your “if”s, “loop”s, and other logic in your code. It is by far the most common kind of bug in an application. (Think: it does the wrong thing)
Wiring: Wiring [...]

Testability Explorer: Using Byte-Code Analysis to Engineer Lasting Social Changes in an Organization’s Software Development Process. (Or How to Get Developers to Write Testable Code)
Presented at 2008 OOPSLA by Miško Hevery a Best Practices Coach @ Google
Abstract
Testability Explorer is an open-source tool that identifies hard-to-test Java code. Testability Explorer provides a repeatable objective metric of [...]

by Miško Hevery
After reading the article on Singletons (the design anti-pattern) and how they are really global variables and dependency injection suggestion to simply pass in the reference to the singleton in a constructor (instead of looking them up in global state), many people incorrectly concluded that now they will have to pass the singleton [...]

by Miško Hevery
Dependency injection asks us to separate the new operators from the application logic. This separation forces your code to have factories which are responsible for wiring your application together. However, better than writing factories,  we want to use automatic dependency injection such as GUICE to do the wiring for us. But can DI [...]

(the other title: Your Application has a Wiring Problem)
In My main() Method Is Better Than Yours we looked into what a main() method should look like. There we introduced a clear separation between (1) the responsibility of constructing the object graph and (2) the responsibility of running the application. The reason that this separation is [...]

By Miško Hevery
People are good at turning concrete examples into generalization. The other way around, it does not work so well. So when I write about general concepts it is hard for people to know how to translate the general concept into concrete code. To remedy this I will try to show few examples of [...]

Since I have gotten lots of love/hate mail on the Singletons are Pathological Liars and Where Have All the Singletons Gone I feel obliged to to do some root cause analysis.
Lets get the definition right. There is Singleton the design pattern (Notice the capital “S” as in name of something) and there is a singleton [...]

by Miško Hevery
In Singletons are Pathological Liars we discussed the problems of having singletons in your code. Let’s build on that and answer the question “If I don’t have singletons how do I ensure there is only one instance of X and how do I get X to all of the places it is needed?”
An [...]

by Miško Hevery
So you join a new project, which has an extensive mature code base. Your new lead asks you to implement a new feature, and, as a good developer, you start by writing a test. But since you are new to the project, you do a lot of exploratory “What happens if I execute [...]

by Miško Hevery
Procedural languages allowed us to remove GOTOs in our code. I would like to think that OO languages allow us to remove IFs (conditionals). I know you can’t remove of all the IFs, but it is interesting just how many IFs you can remove in an application.
You can’t remove these IFs:

Comparing relative sizes [...]