They are so-called because they refer to any particular object. Unlike the primitive data types, the non-primitive ones are created by the users in Java. Examples include arrays, strings, classes, ...

Called primitive types, integral and ... a type’s implementation. In Java, encapsulation basically translates to this simple guideline: “Don’t access your object’s data directly; use ...

In textbooks teaching the OO paradigm using Java, wrapper types are introduced after primitive types. The better way to teach the OO paradigm is to teach expression evaluation using simple objects and ...

but those same methods do work when used from JavaIntegrationTest so I'm not sure what's going on yet. We also need to add support for all the other Java primitive data types as well.

The int is one of Java’s eight Java primitive types, while the Integer wrapper class is one of ... with none of the overhead of object allocation that the Integer class requires, applications that use ...

Even the most complicated classes in Java can be flattened down to nothing more than the set of primitive data types they represent. But primitive types aren’t objects, and that presents a problem.

Therefore, even though Java passes parameters to methods by value, if the variable points to an object reference, the real object will also be changed. Like object types, primitive types are also ...