Such a field is not related to any individual object, but to the class as a whole. At the same time, you need a field to keep track of how many Bicycle objects have been created so that you know what ID to assign to the next one. This release was created for you, eager to use serial number full and without limitations. This ID number is unique to each object and is therefore an instance variable. Any object can change the value of a class variable, but class variables can also be manipulated without creating an instance of the class.įor example, suppose you want to create a number of Bicycle objects and assign each a serial number, beginning with 1 for the first object. Every instance of the class shares a class variable, which is in one fixed location in memory. They are associated with the class, rather than with any object. Fields that have the static modifier in their declaration are called static fields or class variables. This is accomplished with the static modifier. Sometimes, you want to have variables that are common to all objects. Each Bicycle object has its own values for these variables, stored in different memory locations. In the case of the Bicycle class, the instance variables are cadence, gear, and speed. When a number of objects are created from the same class blueprint, they each have their own distinct copies of instance variables. In this section, we discuss the use of the static keyword to create fields and methods that belong to the class, rather than to an instance of the class.
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