Objects and references. An integer like “x” is what we call a “primitive type.” That means that it is a fundamental value. ... How to prevent null pointer exceptions Java.

You might know that Java passes by value, but it helps to understand why. Here's what happens when you pass mutable and immutable object references in Java.

I would like to have some JNI code malloc a block of memory and pass it back to my Java code (in the form of a jlong), so that future calls to other JNI functions can pass this pointer along for ...

In his State of Valhalla blog post, Goetz uses an array of points to illustrate the non-dense nature of references. We can use a class. For example, let’s say we have a Landmark class with a ...