What is class and object Java?

What is class and object Java?

Java is an object-oriented programming language. ... For example: in real life, a car is an object. The car has attributes, such as weight and color, and methods, such as drive and brake. A Class is like an object constructor, or a "blueprint" for creating objects.

Why is class called a factory of objects?

Why is class called the (factory of objects)? A class is called an object factory because objects are created from a class. An objectis an instance of a class. A class is the base of an object, in a class you're describing anything about your wanted object.

What is package give example?

A package means a complete version of an application software installed on your computer, phone etc.... For example, The MS Office package consists of Word, PowerPoint, Excel, Access, Publisher etc.... The Adobe package consists of photoshop, flash etc....

What are instances of a class?

In object-oriented programming (OOP), an instance is a concrete occurrence of any object, existing usually during the runtime of a computer program. ... Each realized variation of that object is an instance of its class. That is, it is a member of a given class that has specified values rather than variables.

What is difference between instance and object?

An instance is a specific representation of an object. An object is a generic thing while an instance is a single object that has been created in memory. Usually an instance will have values assigned to it's properties that differentiates it from other instances of the type of object.

Is invoked to create an object?

When you invoke new to create an object, Java invokes a special method called a constructor to initialize the instance variables. You provide one or more constructors as part of the class definition. The methods that operate on a type are defined in the class definition for that type.

Can you have many classes of the same object?

The only way to pass the same object to two functions of different classes is if one class inherits from the other, and the Object is an instance of the inherited class. The other way would be to weakly type the object upon variable definition and function definition.

Can objects have the same name?

You cannot do that, if the objects are of different classes. It will throw and error. Its same as you cant declare two variables with same names cannot be declared. Because objects are user defined variables.

Why do we create objects in Java?

Java is a heavily object-oriented programming language. When you do work in Java, you use objects to get the job done. You create objects, modify them, move them around, change their variables, call their methods, and combine them with other objects.

How is an object created?

An object is created based on its class. You can consider a class as a blueprint, template, or a description how to create an object. When an object is created, memory is allocated to hold the object properties. An object reference pointing to that memory location is also created.

What are constructors in Java?

A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created.