Java 101: Learn Java

How to use typesafe enums in Java

Use typesafe enums to avoid the problems with traditional enumerated types

How to use Java generics to avoid ClassCastExceptions

Learn how Java’s support for generics helps you develop more robust code

How to use assertions in Java

Use Java assertions to document program correctness and more quickly test and debug your programs

How to describe Java code with annotations

Use annotations to associate metadata with application elements in your Java programs

Packages and static imports in Java

Use packages and static imports to organize top-level types and simplify access to their static members

Static classes and inner classes in Java

Learn how to use the four types of nested classes in your Java code

Get started with method references in Java

Why you should use method references instead of anonymous classes in your functional Java programs

Get started with lambda expressions in Java

Learn how to use lambda expressions and functional programming techniques in your Java programs

Exceptions in Java, Part 2: Advanced features and types

Take your Java exceptions to the next level with stack traces, exception chaining, try-with-resources, final re-throw, and more

Exceptions in Java, Part 1: Exception handling basics

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

Interfaces in Java

Learn the difference between classes and interfaces once and for all, then get started declaring, implementing, and extending interfaces in your Java programs

Class and object initialization in Java

Learn how to to initialize Java classes and objects for successful JVM execution

Java polymorphism and its types

Learn the four types of polymorphism in Java, then start using subtype polymorphism to execute different forms of the same Java method

Inheritance in Java, Part 2: Object and its methods

Get to know Java's Object superclass and its methods for duplicating, comparing, cleaning up, and scheduling Java objects

Inheritance in Java, Part 1: The extends keyword

Use Java's extends keyword to derive a child class from a parent class, invoke parent class constructors and methods, override methods, and more

Classes and objects in Java

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

Loop, switch, or take a break? Deciding and iterating with Java statements

Learn how to use standby statements like for, while, if-else, and break, then get started with the new switch expressions in Java 12

Evaluate Java expressions with operators

Everything you need to know about the Java operator types and using them to write and evaluate Java expressions in Java 12

Elementary Java language features

Learn three ways to document your code, then get started using identifiers, types, literals, and variables in Java 12

Learn Java from the ground up

If you're new to Java then you've come to the right place. Get an overview of the Java platform, then code your first application using Java 12 and the new Java Shell