What is object and object type?

Object Data Type: These are also referred to as Non-primitive or Reference Data Type . They are so-called because they refer to any particular objects. Unlike the primitive data types, the non-primitive ones are created by the users in Java. Examples include arrays, strings, classes, interfaces etc.

An object is a noun (or pronoun) that is governed by a verb or a preposition . There are three kinds of object: Direct Object (e.g., I know him.) Indirect Object (e.g., Give her the prize.) Object of a Preposition (e.g., Sit with them.)

An object is an abstract data type with the addition of polymorphism and inheritance . Rather than structure programs as code and data, an object-oriented system integrates the two using the concept of an “object”. An object has state (data) and behavior (code). Objects can correspond to things found in the real world.

An object’s class defines how the object is implemented. The class defines object’s internal state and the implementation of its operations. In contrast, an object’s type only refers to its interface – a set of requests to which it can respond .