Jeff Friesen

Jeff Friesen is a freelance tutor and software developer with an emphasis on Java and Android. In addition to writing Java and Android 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 TutorTutor.ca.


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:...

Java 101 primer: Composition and inheritance
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Java 101 primer: Composition and inheritance

A quick guide to the composition technique in Java programming. Learn how to use composition to resolve the well-known problem with inheritance.

JavaFX improvements in Java SE 8u40

JavaFX 8u40 added support for accessibility, standard and custom dialogs, a spinner control, and text formatting. Learn about these new capabilities in this installment of Java Q&A.

Java 101 primer: Fields and methods in Java

Java 101 primer: Fields and methods in Java

Learn how to handle fields and methods right, with these seven advanced techniques for object-based programming in Java.

Java 101: Classes and objects in Java

Java 101: Classes and objects in Java

Learn how to make classes, fields, methods, constructors, and objects work together in your Java applications.

Java 101: The essential Java language features tour, Part 7

Java 101: The essential Java language features tour, Part 7

End your tour of Java's essential language features with Java 8's method references, interface default and static methods, and three lesser known language updates, then preview new features coming in Java 9.

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