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= Non-Primitive Data Types = Non-primitive data types, also known as reference types, are data types that are not primitive or basic. They include Strings, Arrays, Classes, Interfaces, and so on.

Overview
Non-primitive data types, also known as reference types, are data types that are not primitive or basic. They refer to objects, hence the name reference types. Unlike primitive types, which are almost always value types, non-primitive types may also be value types.

The main differences between primitive and non-primitive data types are:


 * Primitive types are predefined, while non-primitive types are created by the programmer and are not predefined (except for String).
 * Non-primitive types can be used to call methods to perform certain operations, while primitive types cannot.
 * A primitive type always has a value, while non-primitive types can be null.
 * A primitive type starts with a lowercase letter, while non-primitive types start with an uppercase letter.

Examples

 * Strings: A sequence of characters.
 * Arrays: A collection of elements, each identified by an array index.
 * Classes: User-defined types that encapsulate data and methods that operate on that data.
 * Interfaces: A contract for classes to follow, specifying a set of methods that the class must implement.