Object Oriented Programming Practice Test: Object — Flashcards

Quiz questions on passing and returning object with functions, object reference and memory allocation, object array and usage.

In object-oriented programming (OOP), an object is a unit of code that is the first thing you think about when designing a program. Objects are made into generic classes, and then more generic classes are defined so that objects can share models and reuse class definitions in their code. An object is an instance of a particular class or subclass, and has its own methods or procedures and data variables. 

In object-oriented programming (OOP), objects are the things you think about first in designing a program and they are also the units of code that are eventually derived from the process. In between, each object is made into a generic class of object, and even more generic classes are defined so that objects can share models and reuse the class definitions in their code. Each object is an instance of a particular class or subclass with the class's own methods or procedures and data variables. An object is what actually runs in the computer.
An object can contain data and code that manipulates that data. Objects are components of a program that know how to perform certain actions and how to interact with other elements of the program. For example, a car, house, or laptop are real-world objects that can be represented as an object. 
Objects are created from templates called "classes", which define the properties and behavior of the objects they create. 

In Java, the variables that point to or hold the object are the reference variables. 
For example, MobilePhone iPhone and MobilePhone Nord. iPhone and Nord are currently holding null values, which are the default values. To store actual objects in these variables, you need to initialize them with the objects.