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.

Java 101: Datastructures and algorithms in Java, Part 5

Java 101: Datastructures and algorithms in Java, Part 5

In addition to singly linked lists, Java offers several other types of list that you can use to search and sort stored data in your Java programs.

Java 101: Datastructures and algorithms in Java, Part 4

Java 101: Datastructures and algorithms in Java, Part 4

Learn how to search and sort linked lists in Java! Examples in this tutorial demonstrate how to create a singly linked list, insert and delete nodes in a singly linked list, and more. Find out which algorithms are most used to sort...

Java language oddities

Java language oddities

The Java language includes various behaviors that may puzzle newcomers to the language. This post examines three such behaviors involving arrays, bytes and shorts, and private fields and methods.

Java 101: Datastructures and algorithms in Java, Part 3

Java 101: Datastructures and algorithms in Java, Part 3

Multidimensional arrays are useful for complex computing scenarios, and ragged arrays can help conserve memory for big data applications. Learn how to create multidimensional arrays and ragged arrays and use them in your Java programs....

Base64 encoding and decoding in Java 8

Base64 encoding and decoding in Java 8

Java 8 will be remembered mainly for introducing lambdas, streams, a new date/time model, and Nashorn--but don't miss the new Base64 API. It could be just what you need to ensure data integrity in transit.

Java 101: Datastructures and algorithms in Java, Part 2

Java 101: Datastructures and algorithms in Java, Part 2

Get started with one-dimensional arrays and array variables, then try out five algorithms for searching and sorting arrays in your Java programs

Web services in Java SE, Part 4: SOAP with Attachments API for Java

Learn about SAAJ and other advanced Java SE Web service features

Web services in Java SE, Part 3: Creating RESTful Web services

Learn how to use Java SE's JAX-WS API to create a RESTful-based library Web service

Web services in Java SE, Part 2: Creating SOAP web services

Learn how to use Java SE's JAX-WS API to create a SOAP-based units-conversion Web service.

Java 101: Datastructures and algorithms in Java, Part 1

Java 101: Datastructures and algorithms in Java, Part 1

Programmers use datastructures to store and organize data, and algorithms to manipulate that data. Get the basics of these fundamental programming elements, and find out how they work together in your Java programs

Web services in Java SE, Part 1: Tools overview

Web services in Java SE, Part 1: Tools overview

This post launches a four-part series introducing you to Java SE 6's support for Web services. Later in the series we'll build SOAP-based and RESTful-based Web services and explore advanced Web services topics.

Java library evolution and other puzzlers

Exploring puzzling code to figure out why it doesn't do what seems obvious is one way to improve your programming skills. Puzzle yourself today!

Java 9's other new enhancements, Part 6: Concurrency

Java 9's other new enhancements, Part 6: Concurrency

Java 9 introduces a publish-subscribe framework for reactive streams, improvements to the CompletableFuture class, and other concurrency enhancements

Java 101: Regular expressions in Java, Part 2

Java 101: Regular expressions in Java, Part 2

Complete your introduction to the Regex API, then find out how regular expressions make quicker work of common tasks like code documentation and lexical analysis.

Java 101: Regular expressions in Java, Part 1

Java 101: Regular expressions in Java, Part 1

Pattern matching is an important technique used in text processing, and Regex is here to help. Find out how to use the Pattern class and constructs like quantifiers and boundary matchers to describe patterns in your Java programs.

Java 9's other new enhancements, Part 5: Stack-Walking API

Java 9's other new enhancements, Part 5: Stack-Walking API

Replacing StackTraceElement, the new Stack-Walking API supports filtering and lazy access to stack trace information, and makes it easier to obtain the caller class

Java 9's other new enhancements, Part 4: Multi-release JAR files

Java 9's other new enhancements, Part 4: Multi-release JAR files

A Java 9 extension to the JAR file format makes it easier for third-party libraries and frameworks to use language and API features from newer Java releases

Java 101: Interfaces in Java

Java 101: Interfaces in Java

Extracting class interfaces into Java interfaces can increase the reusability of your code, but only if you know how to use their special properties.

Java 9's other new enhancements, Part 3: The Process API

Java 9's other new enhancements, Part 3: The Process API

Updates to the Process API will make it easier to obtain a process ID, get additional information about a process, and execute actions on process termination

Java 9's other new enhancements, Part 2: Milling Project Coin

Java 9's other new enhancements, Part 2: Milling Project Coin

JEP 213 builds on Java 7's Project Coin with small language improvements and additions for your Java programs

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