[java] What is an attribute in Java?

I read that to get length of an array, I use the length attribute, like arrayName.length. What is an attribute? Is it a class?

An attribute is an instance variable.

Attribute is a public variable inside the class/object. length attribute is a variable of int type.

A class is an element in object oriented programming that aggregates attributes(fields) - which can be public accessible or not - and methods(functions) - which also can be public or private and usually writes/reads those attributes.

so you can have a class like Array with a public attribute lengthand a public method sort().

An abstract class is a type of class that can only be used as a base class for another class; such thus cannot be instantiated. To make a class abstract, the keyword abstract is used. Abstract classes may have one or more abstract methods that only have a header line (no method body). The method header line ends with a semicolon (;). Any class that is derived from the base class can define the method body in a way that is consistent with the header line using all the designated parameters and returning the correct data type (if the return type is not void). An abstract method acts as a place holder; all derived classes are expected to override and complete the method.

Example in Java

abstract public class Shape

{

double area;

public abstract double getArea();

}

Attribute is a synonym of field for array.length

Attributes is same term used alternativly for properties or fields or data members or class members.

A class contains data field descriptions (or properties, fields, data members, attributes), i.e., field types and names, that will be associated with either per-instance or per-class state variables at program run time.

¦ What is an attribute?

– A variable that belongs to an object.Attributes is same term used alternatively for properties or fields or data members or class members

¦ How else can it be called?

– field or instance variable

¦ How do you create one? What is the syntax?

– You need to declare attributes at the beginning of the class definition, outside of any method. The syntax is the following: ;

Attributes are also data members and properties of a class. They are Variables declared inside class.

In this context, "attribute" simply means a data member of an object.