An instance variable differs from a local variable in the nature of its scope and its lifetime. The entire class makes up the scope of an instance variable, not the method in which it was declared.

Developers who create a runnable Java class, be it for a ‘Hello World’ demonstration or to kick off a fully featured enterprise application, will enjoy the following technical benefits when using ...

Method and variable handles vs. Java reflection To truly understand MethodHandles and VarHandles —what they do and why they are useful—it’s helpful to know a few things about reflection in Java.

This post explains how to call a method in Java. Learn how to define methods, call them from other classes, and pass arguments!

Both C and C++ use the const keyword, but those languages aren’t purely object-oriented like Java is, and that belies the crux of the problem. After all, what exactly would it mean for something to be ...

Ever come across the null pointer exception in Java? We explain what this error message means, why it happens, and how to avoid the billion-dollar mistake.