Picture of Lewis Coosner

Lewis Coosner

An electrical engineer by profession, Lewis has been involved in software development since the 1980s. He has programmed in C, C++, Fortran, Assembler, Pascal, Java and Visual Basic, and has extensive experience in the development of systems in the military and engineering environment. Lewis is primarily responsible for developing and presenting the Java and OO-related courses, and was one of the first two Java lecturers in the country to be certified by Sun Microsystems. In his free time, Lewis cycles, kayaks, hikes, caves, climbs and generally exhausts himself.
More posts by Lewis Coosner
Law of demeter. Cartoon of a child saying no, and some code: {myObject.never.talksToStrangers}

The Law of Demeter

The Law of Demeter is a guideline for software design. It is also known as the principle of least knowledge. Simply put: “*Only talk to your immediate friends, don’t talk to strangers*.”

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Image of a building with an unusual architecture

Styles, Patterns and Idioms

We often see the terms “Architectural Style”, “Architectural Pattern”, “Design Pattern” and “Programming Idiom”. What do they mean? What are the differences between them?

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Fluent interfaces in Java: images of a calm river

Fluent Interfaces in Java

A fluent interface in Java makes it easier to use a class. Fluent interfaces make our Java code more readable. Lewis looks at some Java examples of fluid interfaces.

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Diagram showing JVM memory management before and after Java 8. PermGen is replaced with Metaspace.

Java Memory: PermGen vs MetaSpace

The Java Virtual Machines manages memory. PermGen is part of the non-heap memory. From Java 8, PermGen was replaced by a new memory area called MetaSpace. Lewis explains the difference, and reminds developers to monitor memory usage.

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