Jeff Friesen

Jeff Friesen teaches Java technology (including Android) to everyone via articles, blogs, books, and software. In addition to writing Java books for Apress, Jeff has written numerous articles on Java and other technologies for JavaWorld, InformIT, Java.net, and SitePoint. Jeff can be contacted via his website at JavaJeff.ca.


Android Studio for beginners, Part 3: Build and run the app

Android Studio for beginners, Part 3: Build and run the app

Build your app with Gradle, then run it on an Android device emulator or Kindle Fire tablet

Android Studio for beginners, Part 1: Installation and setup

Android Studio for beginners, Part 1: Installation and setup

If you're new to Android Studio, start here. Part 1 walks through installing Android Studio and launching your first Android project

Immutable empty collections and iterators

Immutable empty collections and iterators

Find out why the java.util.Collections class includes static methods that return immutable empty collections and iterators.

When is a character not a character?

The values assigned to char variables don't always represent characters. Learn all about characters and their variables in this edition of Java Q&A.

Exploring JavaFX's Application class

JavaFX's Application class is an essential part of every JavaFX application. Learn about the various capabilities that Application makes available.

The six roles of the interface

Java's interface language feature often puzzles newcomers to this language. Jeff eliminates this mystery by presenting the six roles that interfaces play in the Java language.

Java 101: Class and object initialization in Java

Java 101: Class and object initialization in Java

This final installment in the "Java 101: Foundations" series introduces all of Java's features for initializing classes and objects.

Java 101: Polymorphism in Java

Java 101: Polymorphism in Java

Learn how to use subtype polymorphism to execute different forms of the same Java method

Checkers, anyone?

Checkers, anyone?

Explore the design and implementation of a Swing-based library that provides the user interface for the game of checkers.

Java 101: Inheritance in Java, Part 2

Java 101: Inheritance in Java, Part 2

Get to know the ultimate superclass of Java's class inheritance hierarchy: java.lang.Object.

Java 101: Inheritance in Java, Part 1

Java 101: Inheritance in Java, Part 1

Learn the basics and more of Java inheritance, one of the fundamental concepts of object-oriented programming. Get your head around inheritance concepts and syntax, then go hands-on with the mothership of all Java classes:...

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