Java 101

By Jeff Friesen

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A beginner's library for learning about essential Java programming concepts, syntax, APIs, and packages.

Tutorial

Java 101: Mastering Java exceptions, Part 1

Everything you need to know about throwing, trying, catching, and cleaning up after Java exceptions

06/26/18

Tutorial

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.

06/08/18

Tutorial

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...

03/29/18

Tutorial

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....

02/01/18

Tutorial

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

11/01/17

Tutorial

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

08/10/17

Tutorial

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.

05/16/17

Tutorial

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.

04/13/17

Tutorial

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.

03/17/17

Tutorial

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.

03/03/16

Tutorial

Java 101: Polymorphism in Java

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

02/23/16

Tutorial

Java 101: Inheritance in Java, Part 2

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

10/22/15

Tutorial

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:...

10/22/15

Tutorial

Java 101: Classes and objects in Java

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

09/15/15

Tutorial

Java 101: Deciding and iterating with Java statements

Learn how to use statements like if, if-else, switch, and while to specify expressions, make decisions, and iterate in your Java programs.

06/30/15

Tutorial

Java 101: Evaluate Java expressions with operators

Continue learning the fundamentals of Java programming, with this Java 101 introduction to using operators to write compound Java expressions.

06/26/15

Tutorial

Java 101: Elementary Java language features

Learn three ways to document your code and find out why Unicode is the universal encoding standard for Java, then practice using identifiers, types, literals, and variables in your Java programs. All examples are written in Java 8.

05/26/15

Tutorial

Java 101: Learn Java from the ground up

If you're new to Java then you've come to the right place: Get started with the foundations of the Java platform and code your first Java application with this classic tutorial for beginners.

05/12/15

Tutorial

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.

04/16/15

Tutorial

Java 101: The essential Java language features tour, Part 6

Learn by example how lambdas interact with scopes, local variables, the this and super keywords, and exceptions in Java programs.

03/12/15

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